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1.The old car's paint has turned black rust.
这辆旧车的车漆已经变成了黑锈。
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2. The metal was left exposed to the elements for too long, resulting in black rust.
金属暴露在恶劣环境中时间过长，导致生锈。
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3.To prevent rust, it is important to regularly clean and oil the car.
为了预防生锈，定期清洁和给汽车加油是很重要的。