Knives get rusty when not sharpened.
快刀不磨黄锈起。
Keep up your English, or it will get rusty.
你的英语要继续学下去，否则会荒疏的。
How can it happen that so many machine parts get rusty?
怎么竟会有这么多机器零件生锈呢？
Drill pipes get rusty in air almost as fast as they do in water.
空气中生锈的速度和在水中几乎一样快。
Drill pipes get rusty in air almost as fast as they do in water.
空气中生锈的速度和在水中几乎一样快。
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