名词
中文翻译：洞
同义词：
['hole', 'crevice', 'gap', 'opening']
例句：
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1. The underhole in the wallis big enough to fit a basketball.
墙上的这个洞足够大，可以放一个篮球。
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2. The holein the fence was too smallfor the dog to pass through.
围栏上的洞太小，狗无法穿过。
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3. The gapbetween the two pieces of wood allows airto circulate.
两块木头之间的缝隙允许空气流通。