名词
中文翻译：原始坑洞
同义词：
['primordial pit', 'primitive cave', 'primitive hole']
例句：
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1. The ancientruins are evidence of a primitive civilization that existed long ago.
古代遗迹是远古文明的证据，它们很久以前就存在了。
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2. The primitive tribe lived in the forest for thousands of years before they were discovered by Europeans.
这个原始部落在被发现之前生活在森林中数千年。
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3. The primitive man had no concept of time or space, just instinctively knowing how to survive.
原始人没有时间或空间的概念，只是本能地知道如何生存。