名词
中文翻译：Unknown
同义词：
['rust', 'corrosion', 'oxidation']
例句：
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1. The iron nail has started to sarmentum.
这个铁钉开始生锈了。
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2. The old car had a lot of sarmentum on its body.
这辆旧车车身有很多锈迹。
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3. The rusted metal was difficult to remove from the wall.
生锈的金属很难从墙上移除。