Pieces of which are left in the rain become rusty.

铁片如果被扔在雨里就生锈。

youdao

If the drill pipe threads become rusty, rust will have to be cleaned.

如果钻杆丝扣生锈，必须清除掉。

youdao

The door hinge has become rusty from years of exposure to the elements.

淋，这些门上的绷弓子已经生锈。

youdao

As almost always, Mr. Washington brings extraordinary depth and intelligence to his role, even though the title character, who learned his killing skills in counter-insurgency work, has become a rusty staple of the action genre.

WSJ: Denzel Does Malice