名词
中文翻译：锈
同义词：
['stain', 'tarnish', 'corrosion']
例句：
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1. Theold car's engine was badly rusted.
这辆旧车引擎严重生锈了。
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2. The metal parts were covered in athick layer of rust.
金属部件上覆盖着厚厚的一层锈。
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3. To prevent rust,it is important to regularly clean and oilthe metal surfaces.
为了防止生锈，定期清洁和润滑金属表面是很重要的。