名词
中文翻译：龙骨
同义词：
['keel', 'keelback', 'stern']
例句：
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1. The boat's keel is perfectly aligned with the waves.
这艘船的龙骨与波浪完美对齐。
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2. The ship's keel was damaged during the storm.
风暴期间，这艘船的龙骨受损了。
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3. The keel of the ship is made of steel to withstand the force of the waves.
这艘船的龙骨是用钢制成的，以承受海浪的力量。