diff --git a/rust-by-example/po/zh.po b/rust-by-example/po/zh.po
index 16c8ba4..2411e9f 100644
--- a/rust-by-example/po/zh.po
+++ b/rust-by-example/po/zh.po
@@ -12714,7 +12714,7 @@ msgid ""
 "heap is freed."
 msgstr ""
 "在 Rust 中，所有值默认都是栈分配的。通过创建 `Box<T>`，可以将值**装箱**（在堆上分配）。"
-"Box 是指向堆分配的 `T` 类型值的智能指针。当 box 离开作用域时，会调用其析构函数，"
+"Box 是指向堆分配的 `T` 类型值的智能指针。当 Box 离开作用域时，会调用其析构函数，"
 "内部对象被销毁，堆上的内存被释放。"
 
 #: src/std/box.md:8
@@ -12898,7 +12898,7 @@ msgid ""
 "    // count is enumerated in a separate variable (`i`)\n"
 msgstr ""
 "// 遍历 `Vector` 时，可以同时用一个单独的变量（`i`）\n"
-"// 来枚举迭代计数\n"
+"    // 来枚举迭代计数\n"
 
 #: src/std/vec.md:55
 msgid "\"In position {} we have value {}\""
@@ -12910,7 +12910,7 @@ msgid ""
 "    // over in a way that allows modifying each value\n"
 msgstr ""
 "// 借助 `iter_mut`，可变的 `Vector` 也可以被遍历，\n"
-"// 并且允许修改每个值\n"
+"    // 并且允许修改每个值\n"
 
 #: src/std/vec.md:63
 msgid "\"Updated vector: {:?}\""
@@ -13966,7 +13966,6 @@ msgid ""
 "        // reference in the memory heap.\n"
 msgstr ""
 "// 这里没有指定值，因为它是指向堆内存中引用的指针。\n"
-"        // \n"
 
 #: src/std/arc.md:24
 msgid ""
@@ -13974,7 +13973,6 @@ msgid ""
 "            // in the Arc variable pointer's location.\n"
 msgstr ""
 "// 由于使用了 Arc，可以使用 Arc 变量指针所指向的值来生成线程。\n"
-"            // \n"
 
 #: src/std/arc.md:30
 msgid "// Make sure all Arc instances are printed from spawned threads.\n"
diff --git a/rust-by-example/src/generics/new_types.md b/rust-by-example/src/generics/new_types.md
index 010c1ff..dc0b15b 100644
--- a/rust-by-example/src/generics/new_types.md
+++ b/rust-by-example/src/generics/new_types.md
@@ -17,7 +17,6 @@ impl Years {
     }
 }
 
-
 impl Days {
     /// truncates partial years
     pub fn to_years(&self) -> Years {
diff --git a/rust-by-example/src/primitives/array.md b/rust-by-example/src/primitives/array.md
index 704a213..e1c303a 100644
--- a/rust-by-example/src/primitives/array.md
+++ b/rust-by-example/src/primitives/array.md
@@ -63,7 +63,7 @@ fn main() {
         }
     }
 
-    // Out of bound indexing on array causes compile time error.
+    // Out of bound indexing on array with constant value causes compile time error.
     //println!("{}", xs[5]);
     // Out of bound indexing on slice causes runtime error.
     //println!("{}", xs[..][5]);
diff --git a/rust-by-example/src/std_misc/file/read_lines.md b/rust-by-example/src/std_misc/file/read_lines.md
index 7f186d4..837bac3 100644
--- a/rust-by-example/src/std_misc/file/read_lines.md
+++ b/rust-by-example/src/std_misc/file/read_lines.md
@@ -56,7 +56,7 @@ fn main() {
     // File hosts.txt must exist in the current path
     if let Ok(lines) = read_lines("./hosts.txt") {
         // Consumes the iterator, returns an (Optional) String
-        for line in lines.flatten() {
+        for line in lines.map_while(Result::ok) {
             println!("{}", line);
         }
     }