名词
中文翻译：火山口
同义词：
['pit', 'depression例句：1. The volcano erupted', 'leaving behind a crater.（这座火山爆发了，留下了一个坑洼。）2. The crater is filled with water and surrounded by trees.（这个坑洼里满是水，周围长着树木。）']
例句：
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1. The volcano erupted, leaving behind a crater.
这座火山爆发了，留下了一个坑洼。
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2. The crater is filled with water and surrounded by trees.
这个坑洼里满是水，周围长着树木。
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3. Craters are common on the moon's surface due to its extreme temperature differences.
月球表面由于温度差异极大而常见到坑洼。