If the machinery were not maintained properly, It would get rusty as time passes.
机器要不好好养护，久而久之就要生锈。
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。
Even your bike riding skills can get rusty if you don't use them regularly.
如果不常练习，你有可能连自行车也会忘记怎么骑。
Some people's bodies get 'rusty' faster than others, and this makes them age more quickly.
某些人的身体比其他人‘生锈’得快，导致他们更快衰老。
Some people's bodies get 'rusty' faster than others, and this makes them age more quickly.
某些人的身体比其他人‘生锈’得快，导致他们更快衰老。
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