名词
中文翻译：洞
同义词：
['cave', 'pit', 'well', 'hole例句：1. The sinkhole in the ground was filled with water.（地下的洞里充满了水。）']
例句：
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1. The sinkhole in the ground was filled with water.
地下的洞里充满了水。
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2. The workers were digging a new well when they discovered the sinkhole.
工人们在挖新井时发现了这个洞。
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3. The sinkhole was too deep for us to climb out of.
这个洞太深了，我们爬不出去。