diff --git a/book/en-us/05-pointers.md b/book/en-us/05-pointers.md
index d2e6eb0..4f30d8d 100644
--- a/book/en-us/05-pointers.md
+++ b/book/en-us/05-pointers.md
@@ -187,7 +187,7 @@ The solution to this problem is to use the weak reference pointer `std::weak_ptr
 
 In the above figure, only B is left in the last step, and B does not have any smart pointers to reference it, so this memory resource will also be released.
 
-`std::weak_ptr` has no `*` operator and `->` operator, so it can't operate on resources. Its only function is to check if `std::shared_ptr` exists, its `expired() The ` method can return `true` when the resource is not released, otherwise it returns `false`.
+`std::weak_ptr` has no `*` operator and `->` operator, so it can't operate on resources. Its only function is to check if `std::shared_ptr` exists, its `expired()` method can return `false` when the resource is not released, otherwise it returns `true`.
 
 ## Conclusion
 
@@ -201,4 +201,4 @@ The technology of smart pointers is not novel. It is a common technology in many
 
 ## Licenses
 
-<a rel="license" href="http://creativecommons.org/licenses/by-nc-nd/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by-nc-nd/4.0/88x31.png" /></a><br />This work was written by [Ou Changkun](https://changkun.de) and licensed under a <a rel="license" href="http://creativecommons.org/licenses/by-nc-nd/4.0/">Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License</a>. The code of this repository is open sourced under the [MIT license](../../LICENSE).
\ No newline at end of file
+<a rel="license" href="http://creativecommons.org/licenses/by-nc-nd/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by-nc-nd/4.0/88x31.png" /></a><br />This work was written by [Ou Changkun](https://changkun.de) and licensed under a <a rel="license" href="http://creativecommons.org/licenses/by-nc-nd/4.0/">Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License</a>. The code of this repository is open sourced under the [MIT license](../../LICENSE).
diff --git a/book/zh-cn/05-pointers.md b/book/zh-cn/05-pointers.md
index 99d76a4..a083027 100644
--- a/book/zh-cn/05-pointers.md
+++ b/book/zh-cn/05-pointers.md
@@ -175,7 +175,7 @@ int main() {
 
 在上图中，最后一步只剩下 B，而 B 并没有任何智能指针引用它，因此这块内存资源也会被释放。
 
-`std::weak_ptr` 没有 `*` 运算符和 `->` 运算符，所以不能够对资源进行操作，它的唯一作用就是用于检查 `std::shared_ptr` 是否存在，其 `expired()` 方法能在资源未被释放时，会返回 `true`，否则返回 `false`。
+`std::weak_ptr` 没有 `*` 运算符和 `->` 运算符，所以不能够对资源进行操作，它的唯一作用就是用于检查 `std::shared_ptr` 是否存在，其 `expired()` 方法能在资源未被释放时，会返回 `false`，否则返回 `true`。
 
 ## 总结