As with implicit locks, only one thread can own a lock object at a time.
同严格实现的锁一样，一个线程一次只能拥有一个锁对象。
Lock objects work very much like the implicit locks used by synchronized code.
锁对象的工作原理和通过同步方法严格实现的锁一样。
The biggest advantage of lock objects over implicit locks is their ability to back out of an attempt to acquire a lock.
锁对象比严格的锁最大的优势是他们能够从获得一个锁返回。
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