名词
中文翻译：铜底
同义词：
['copper base', 'copper bottom']
例句：
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1.The boat's copper bottom was scratched by the rocks.
船的铜底被岩石刮伤了。
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2.The new car has a copper bottom that is easy to clean.
新车有一个容易清洁的铜底。
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3. The old house had a copper bottom that was very sturdy.
这所旧房子有一个非常坚固的铜底。