If you have two operations that require synchronization separated by a small block of thread-safe code, you are generally better just using a single synchronized block.
要是您想用一小块线程安全代码把要求同步的两个操作隔开，那么只使用一个同步块一般会更好些。
In cases where synchronization is necessary, the synchronized code block should be minimized.
在有必要进行同步的场合下，应该尽量缩小同步代码块。
But if the hashes differ, the out-of-date block is marked as out of sync, and subsequent synchronization ensures that the block is properly synchronized.
如果散列值不相同，将过期的数据块标记为不同步，随后的同步确保数据块是正确同步的。
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