名词
中文翻译：锁
同义词：
['letterbox', 'letter box例句：1. The letter lock on the door is broken.（门上的信箱锁坏了。）2. He locked his letter box and went to bed early.（他锁好了信箱就早早地上床睡觉了。）']
例句：
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1. The letter lock on the door is broken.
门上的信箱锁坏了。
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2. He locked his letter box and went to bed early.
他锁好了信箱就早早地上床睡觉了。
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3.The thief tried to break into the letter box, but it was too strong.
小偷试图撬开信箱，但太结实了。