动词短语
中文翻译：自行封闭
同义词：
['close', 'enclose', 'encroach']
例句：
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1.The tunnel closed off from the outside world.
隧道从外部世界自行封闭。
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2. The river encroached on the city's boundaries.
河流向城市边界自行推进。
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3. The car was closed-on-itself when it hit a pothole.
汽车在遇到一个坑洼时自行封闭了。