名词
中文翻译：封闭
同义词：
['close', 'seal', 'lock', 'latch']
例句：
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1. The door was closed tightly tokeep out the cold wind.
门被紧紧地关上，以挡住冷风。
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2. The safe issecurely locked with a combination lock.
保险箱用一个组合锁安全地锁住了。
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3. Thegate was latched shut to preventany intruders.
大门被闩上了，以防任何入侵者。