diff --git a/po/ko.po b/po/ko.po
index 26f842ea82e5..93d7f8e52cb7 100644
--- a/po/ko.po
+++ b/po/ko.po
@@ -11473,6 +11473,24 @@ msgid ""
 "}\n"
 "```"
 msgstr ""
+"```rust,editable\n"
+"use std::thread;\n"
+"use std::time::Duration;\n"
+"\n"
+"fn main() {\n"
+"    thread::spawn(|| {\n"
+"        for i in 1..10 {\n"
+"            println!(\"Count in thread: {i}!\");\n"
+"            thread::sleep(Duration::from_millis(5));\n"
+"        }\n"
+"    });\n"
+"\n"
+"    for i in 1..5 {\n"
+"        println!(\"Main thread: {i}\");\n"
+"        thread::sleep(Duration::from_millis(5));\n"
+"    }\n"
+"}\n"
+"```"
 
 #: src/concurrency/threads.md:24
 msgid ""
@@ -11527,6 +11545,17 @@ msgid ""
 "}\n"
 "```"
 msgstr ""
+"```rust,editable,compile_fail\n"
+"use std::thread;\n"
+"\n"
+"fn main() {\n"
+"    let s = String::from(\"Hello\");\n"
+"\n"
+"    thread::spawn(|| {\n"
+"        println!(\"Length: {}\", s.len());\n"
+"    });\n"
+"}\n"
+"```"
 
 #: src/concurrency/scoped-threads.md:17
 msgid "However, you can use a [scoped thread][1] for this:"
@@ -11548,6 +11577,19 @@ msgid ""
 "}\n"
 "```"
 msgstr ""
+"```rust,editable\n"
+"use std::thread;\n"
+"\n"
+"fn main() {\n"
+"    let s = String::from(\"Hello\");\n"
+"\n"
+"    thread::scope(|scope| {\n"
+"        scope.spawn(|| {\n"
+"            println!(\"Length: {}\", s.len());\n"
+"        });\n"
+"    });\n"
+"}\n"
+"```"
 
 #: src/concurrency/scoped-threads.md:37
 msgid ""
@@ -11590,6 +11632,24 @@ msgid ""
 "}\n"
 "```"
 msgstr ""
+"```rust,editable\n"
+"use std::sync::mpsc;\n"
+"use std::thread;\n"
+"\n"
+"fn main() {\n"
+"    let (tx, rx) = mpsc::channel();\n"
+"\n"
+"    tx.send(10).unwrap();\n"
+"    tx.send(20).unwrap();\n"
+"\n"
+"    println!(\"Received: {:?}\", rx.recv());\n"
+"    println!(\"Received: {:?}\", rx.recv());\n"
+"\n"
+"    let tx2 = tx.clone();\n"
+"    tx2.send(30).unwrap();\n"
+"    println!(\"Received: {:?}\", rx.recv());\n"
+"}\n"
+"```"
 
 #: src/concurrency/channels.md:27
 msgid ""
@@ -11636,6 +11696,56 @@ msgid ""
 "```"
 msgstr ""
 
+#: src/concurrency/channels/unbounded.md:5
+msgid ""
+"```rust,editable\n"
+"use std::sync::mpsc;\n"
+"use std::thread;\n"
+"use std::time::Duration;\n"
+"\n"
+"fn main() {\n"
+"    let (tx, rx) = mpsc::channel();\n"
+"\n"
+"    thread::spawn(move || {\n"
+"        let thread_id = thread::current().id();\n"
+"        for i in 1..10 {\n"
+"            tx.send(format!(\"Message {i}\")).unwrap();\n"
+"            println!(\"{thread_id:?}: sent Message {i}\");\n"
+"        }\n"
+"        println!(\"{thread_id:?}: done\");\n"
+"    });\n"
+"    thread::sleep(Duration::from_millis(100));\n"
+"\n"
+"    for msg in rx.iter() {\n"
+"        println!(\"Main: got {msg}\");\n"
+"    }\n"
+"}\n"
+"```"
+msgstr ""
+"```rust,editable\n"
+"use std::sync::mpsc;\n"
+"use std::thread;\n"
+"use std::time::Duration;\n"
+"\n"
+"fn main() {\n"
+"    let (tx, rx) = mpsc::channel();\n"
+"\n"
+"    thread::spawn(move || {\n"
+"        let thread_id = thread::current().id();\n"
+"        for i in 1..10 {\n"
+"            tx.send(format!(\"Message {i}\")).unwrap();\n"
+"            println!(\"{thread_id:?}: sent Message {i}\");\n"
+"        }\n"
+"        println!(\"{thread_id:?}: done\");\n"
+"    });\n"
+"    thread::sleep(Duration::from_millis(100));\n"
+"\n"
+"    for msg in rx.iter() {\n"
+"        println!(\"Main: got {msg}\");\n"
+"    }\n"
+"}\n"
+"```"
+
 #: src/concurrency/channels/bounded.md:1
 msgid "# Bounded Channels"
 msgstr "# 경계가 있는 채널(Bounded Channels)"
@@ -11670,6 +11780,29 @@ msgid ""
 "}\n"
 "```"
 msgstr ""
+"```rust,editable\n"
+"use std::sync::mpsc;\n"
+"use std::thread;\n"
+"use std::time::Duration;\n"
+"\n"
+"fn main() {\n"
+"    let (tx, rx) = mpsc::sync_channel(3);\n"
+"\n"
+"    thread::spawn(move || {\n"
+"        let thread_id = thread::current().id();\n"
+"        for i in 1..10 {\n"
+"            tx.send(format!(\"Message {i}\")).unwrap();\n"
+"            println!(\"{thread_id:?}: sent Message {i}\");\n"
+"        }\n"
+"        println!(\"{thread_id:?}: done\");\n"
+"    });\n"
+"    thread::sleep(Duration::from_millis(100));\n"
+"\n"
+"    for msg in rx.iter() {\n"
+"        println!(\"Main: got {msg}\");\n"
+"    }\n"
+"}\n"
+"```"
 
 #: src/concurrency/shared_state.md:1
 msgid "# Shared State"
@@ -11766,6 +11899,21 @@ msgid ""
 "}\n"
 "```"
 msgstr ""
+"```rust,editable\n"
+"use std::sync::Mutex;\n"
+"\n"
+"fn main() {\n"
+"    let v = Mutex::new(vec![10, 20, 30]);\n"
+"    println!(\"v: {:?}\", v.lock().unwrap());\n"
+"\n"
+"    {\n"
+"        let mut guard = v.lock().unwrap();\n"
+"        guard.push(40);\n"
+"    }\n"
+"\n"
+"    println!(\"v: {:?}\", v.lock().unwrap());\n"
+"}\n"
+"```"
 
 #: src/concurrency/shared_state/mutex.md:22
 msgid ""
@@ -11820,7 +11968,7 @@ msgstr ""
 
 #: src/concurrency/shared_state/example.md:23
 msgid "Possible solution:"
-msgstr ""
+msgstr "가능한 해결책:"
 
 #: src/concurrency/shared_state/example.md:25
 msgid ""
@@ -11947,7 +12095,7 @@ msgstr "# 예제"
 
 #: src/concurrency/send-sync/examples.md:3
 msgid "## `Send + Sync`"
-msgstr ""
+msgstr "## `Send + Sync`"
 
 #: src/concurrency/send-sync/examples.md:5
 msgid "Most types you come across are `Send + Sync`:"
@@ -11977,7 +12125,7 @@ msgstr "제네릭 타입은 일반적으로 타입 파라메터가 `Send + Sync`
 
 #: src/concurrency/send-sync/examples.md:17
 msgid "## `Send + !Sync`"
-msgstr ""
+msgstr "## `Send + !Sync`"
 
 #: src/concurrency/send-sync/examples.md:19
 msgid ""
@@ -11992,10 +12140,14 @@ msgid ""
 "* `Cell<T>`\n"
 "* `RefCell<T>`"
 msgstr ""
+"* `mpsc::Sender<T>`\n"
+"* `mpsc::Receiver<T>`\n"
+"* `Cell<T>`\n"
+"* `RefCell<T>`"
 
 #: src/concurrency/send-sync/examples.md:27
 msgid "## `!Send + Sync`"
-msgstr ""
+msgstr "## `!Send + Sync`"
 
 #: src/concurrency/send-sync/examples.md:29
 msgid "These types are thread-safe, but they cannot be moved to another thread:"
@@ -12009,7 +12161,7 @@ msgstr "* `MutexGuard<T>`: 내부적으로, 운영체제가 제공하는 primiti
 
 #: src/concurrency/send-sync/examples.md:34
 msgid "## `!Send + !Sync`"
-msgstr ""
+msgstr "## `!Send + !Sync`"
 
 #: src/concurrency/send-sync/examples.md:36
 msgid "These types are not thread-safe and cannot be moved to other threads:"
@@ -12025,6 +12177,107 @@ msgstr ""
 "* `Rc<T>`: `Rc<T>` 는 아토믹하지 않은 방식으로 참조 카운트를 조작하는 `RcBox<T>`를 참조합니다.\n"
 "* `*const T`, `*mut T`: 러스트는 포인터가 스레드 안전하지 않다고 가정합니다."
 
+#: src/concurrency/send-sync/send.md:13
+msgid ""
+"As an example, a connection to the SQLite library must only be accessed from "
+"a\n"
+"single thread."
+msgstr ""
+"예를 들어 SQLite 라이브러리 연결은 단일 스레드에서만\n"
+"액세스해야 합니다."
+
+#: src/concurrency/shared_state/arc.md:5
+msgid ""
+"```rust,editable\n"
+"use std::thread;\n"
+"use std::sync::Arc;\n"
+"\n"
+"fn main() {\n"
+"    let v = Arc::new(vec![10, 20, 30]);\n"
+"    let mut handles = Vec::new();\n"
+"    for _ in 1..5 {\n"
+"        let v = Arc::clone(&v);\n"
+"        handles.push(thread::spawn(move || {\n"
+"            let thread_id = thread::current().id();\n"
+"            println!(\"{thread_id:?}: {v:?}\");\n"
+"        }));\n"
+"    }\n"
+"\n"
+"    handles.into_iter().for_each(|h| h.join().unwrap());\n"
+"    println!(\"v: {v:?}\");\n"
+"}\n"
+"```"
+msgstr ""
+"```rust,editable\n"
+"use std::thread;\n"
+"use std::sync::Arc;\n"
+"\n"
+"fn main() {\n"
+"    let v = Arc::new(vec![10, 20, 30]);\n"
+"    let mut handles = Vec::new();\n"
+"    for _ in 1..5 {\n"
+"        let v = Arc::clone(&v);\n"
+"        handles.push(thread::spawn(move || {\n"
+"            let thread_id = thread::current().id();\n"
+"            println!(\"{thread_id:?}: {v:?}\");\n"
+"        }));\n"
+"    }\n"
+"\n"
+"    handles.into_iter().for_each(|h| h.join().unwrap());\n"
+"    println!(\"v: {v:?}\");\n"
+"}\n"
+"```"
+
+#: src/concurrency/shared_state/example.md:25
+msgid ""
+"```rust,editable\n"
+"use std::sync::{Arc, Mutex};\n"
+"use std::thread;\n"
+"\n"
+"fn main() {\n"
+"    let v = Arc::new(Mutex::new(vec![10, 20, 30]));\n"
+"\n"
+"    let v2 = Arc::clone(&v);\n"
+"    let handle = thread::spawn(move || {\n"
+"        let mut v2 = v2.lock().unwrap();\n"
+"        v2.push(10);\n"
+"    });\n"
+"\n"
+"    {\n"
+"        let mut v = v.lock().unwrap();\n"
+"        v.push(1000);\n"
+"    }\n"
+"\n"
+"    handle.join().unwrap();\n"
+"\n"
+"    println!(\"v: {v:?}\");\n"
+"}\n"
+"```"
+msgstr ""
+"```rust,editable\n"
+"use std::sync::{Arc, Mutex};\n"
+"use std::thread;\n"
+"\n"
+"fn main() {\n"
+"    let v = Arc::new(Mutex::new(vec![10, 20, 30]));\n"
+"\n"
+"    let v2 = Arc::clone(&v);\n"
+"    let handle = thread::spawn(move || {\n"
+"        let mut v2 = v2.lock().unwrap();\n"
+"        v2.push(10);\n"
+"    });\n"
+"\n"
+"    {\n"
+"        let mut v = v.lock().unwrap();\n"
+"        v.push(1000);\n"
+"    }\n"
+"\n"
+"    handle.join().unwrap();\n"
+"\n"
+"    println!(\"v: {v:?}\");\n"
+"}\n"
+"```"
+
 #: src/exercises/day-4/morning.md:1 src/exercises/day-4/android.md:1
 msgid "# Exercises"
 msgstr "# 연습문제"