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。

《新英汉大辞典》

Knives get rusty when not sharpened.

快刀不磨黄锈起。

youdao

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。

youdao

It is absurd to believe that we cure it by pretending nuclear weapons don't matter and letting ours get rusty and unreliable.

CENTERFORSECURITYPOLICY: Test-Ban Trap

Silent missives are great, but before our vocal chords get all rusty from disuse, let's make telephobia a thing of the past.

CNN: A call to pick up the phone

But Matthew Broderick, as her husband, a Caspar Milquetoast with a flap of hair falling over his forehead, never seems to get into the movie at all, and, somewhere in the middle, the rusty gothic-horror mechanics underneath the comedy bring everything to a grinding halt.

NEWYORKER: The Stepford Wives