What object has keys that open no locks, space but no room.

什么东西有钥匙但是没有锁，有空间没有房间？

youdao

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。

youdao

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。

youdao