diff --git a/book/zh-cn/09-others.md b/book/zh-cn/09-others.md
index a168442..da6ccf5 100644
--- a/book/zh-cn/09-others.md
+++ b/book/zh-cn/09-others.md
@@ -102,9 +102,9 @@ C++11 提供了原始字符串字面量的写法，可以在一个字符串前
 #include <string>
 
 int main() {
-std::string str = R"(C:\\What\\The\\Fxxk)";
-std::cout << str << std::endl;
-return 0;
+    std::string str = R"(C:\What\The\Fxxk)";
+    std::cout << str << std::endl;
+    return 0;
 }
 ```
 
diff --git a/pdf/zh-cn/modern-cpp-tutorial.pdf b/pdf/zh-cn/modern-cpp-tutorial.pdf
index 75d6ab3..f4522d9 100644
Binary files a/pdf/zh-cn/modern-cpp-tutorial.pdf and b/pdf/zh-cn/modern-cpp-tutorial.pdf differ