名词
中文翻译：洞
同义词：
['hole', 'gap', 'crevice', 'aperture']
例句：
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1. The rock is hollow, with a pontal in the center.
这块石头是空心的，中间有一个洞。
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2. The hole in the wall was big enough to crawl through.
墙上的那个洞足够大，可以爬过去。
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3. The gap between the two buildings is too wide for me to walk through.
两座建筑之间的空隙太宽了，我无法走过去。