名词
中文翻译：第一底部
同义词：
['first layer', 'first part', 'initial bottom例句：1. The engineer designed the first bottom of the ship to be made of steel.（工程师设计了船的第一底部，由钢制成。）']
例句：
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1. The engineer designed the first bottom of the ship to be made of steel.
工程师设计了船的第一底部，由钢制成。
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2. The first bottom is where the water comes in and mixes with the air.
第一底部是水进入并与空气混合的地方。
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3. The first bottom of the tunnel is lined with bricks to prevent leaks.
隧道的第一底部被砖块衬砌，以防止泄漏。