名词
中文翻译：Unknown
同义词：
['rust', 'rusty layer', 'iron oxide layer']
例句：
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1. The old car has a lot of iron scale on the engine.
这辆旧车引擎上有很多铁锈。
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2. The rusted metal was difficult to remove from the wall.
生锈的金属很难从墙上去除。
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3. The iron scale on the roof is preventing us from climbing up there.
屋顶上的铁锈阻止我们爬上去。