介词短语
中文翻译：在
同义词：
['at the very bottom', 'at the foundation of', 'at the very back of']
例句：
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1. The box is too heavy to carry at the bottom of the stairs.
这个箱子太重了，无法从楼梯的底部搬走。
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2. The book is at the bottom of the shelf.
这本书在书架的最底部。
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3.The team was at the bottom of the standings after the loss.
球队在输球后排在积分榜的最后。