On the other hand, we don't want to allocate too many lock objects, especially if the ConcurrentDictionary only ends up storing only a small number of items.
另一方面，我们又不希望分配太多锁对象，特别是在ConcurrentDictionary最后只存储了很少项目的时候。
You can use the Timeline to hide or lock objects easily. This is useful when a slide contains many objects and you need to edit the objects separately.
使用时间轴可以很容易的隐藏或锁定对象。当幻灯片包含许多对象，而您需要分别编辑对象时，时间轴十分有用。
The Lock classes are just ordinary classes, and the JVM does not (yet) have any knowledge of which Lock objects are owned by specific threads.
Lock 类只是普通的类，JVM 不知道具体哪个线程拥有 Lock 对象。
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