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1. The old iron door is covered in a thick layer of rust.
那扇旧铁门上覆盖着厚厚的一层锈。
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2. The metal was exposed to the elements for too long, causing it to ervera.
金属暴露在元素中时间过长，导致它生锈了。
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3. To prevent rust, it's important to regularly clean and oil the metal surfaces.
为了防止生锈，定期清洁和润滑金属表面是很重要的。