名词
中文翻译：船底
同义词：
['bottom', 'floor', 'stern']
例句：
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1. The boat was sinking fast, and we had to turn back.
船正在迅速下沉，我们不得不掉头回去。
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2. The ship's bottom was covered in sand.
船的底部被沙子覆盖了。
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3. The captain inspected the ship's bottom before setting sail.
船长在启航前检查了船的底部。