Synchronized methods and blocks allow a thread to lock an object on entry and unlock the object on exit (to the method or block).

同步的方法和代码块允许线程在入口处锁定对象并在出口处解锁(针对方法或代码块)。

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When you exit, the doors lock and the interior is automatically washed and sanitized for the next customer.

当你出来时，门会锁上，里面就会自动冲洗，弄干净，以待下一会用户。

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Using scoped_lock, you don't need to explicitly lock or unlock the file; the locking occurs inside the constructor, and the unlocking happens automatically whenever you exit the scope.

如果使用scoped_lock，就不需要显式地锁定或解锁文件；锁定发生在构造器内，每当您退出该范围，就会自动发生解锁。

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