名词
中文翻译：耗尽的钥匙
同义词：
['used up key', "run out key例句：1. The old key was worn out and couldn't open the lock anymore.（旧钥匙磨损了，再也打不开锁了。）"]
例句：
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1. The old key was worn out and couldn't open the lock anymore.
旧钥匙磨损了，再也打不开锁了。
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2.We ran out of time before we could finish the project.
我们时间用完了，还没来得及完成这个项目。
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3.The car keys were run out when she left the house.
她离开家时，汽车钥匙已经用完了。