名词
中文翻译：Unknown
同义词：
['rust', 'rusty', 'stain']
例句：
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1. The iron pipe is covered with a layer of rust.
这根铁管上覆盖着一层锈。
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2. He noticed the stain on his shirt and realized it was caused by the rust.
他注意到衬衫上的污渍，意识到这是由铁锈造成的。
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3. The rusty nail had to be removed before painting the wall.
在粉刷墙壁之前，必须将生锈的钉子取出来。