名词
中文翻译：底部
同义词：
['底，中心，核心例句：1. The bottom of the pool was covered in green grass.（泳池的底部覆盖着绿色的草。）2. The center of the city is bustling with activity.（市中心繁忙活跃。）']
例句：
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1. The bottom of the pool was covered in green grass.
泳池的底部覆盖着绿色的草。
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2. The center of the city is bustling with activity.
市中心繁忙活跃。
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3. The core of the problem lies in the lack of communication.
问题的核心在于缺乏沟通。