rusty

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These substances leak from the rusty barrels and pollute soil.
这些物质从生锈的桶中渗出然后污染了土壤。
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》
He looked down, to relieve his neck, and stared at the rusty chain at his feet, coiled around the metal rod that connected the cycle to the cart.
他低下了头，来缓解脖子的疼痛，眼睛停留在脚下生锈的铁链上，那铁链绕在连接自行车和拖车的金属杆周围。

"A citizen scientist outside Peoria actually sent in a photograph of a species of bumblebee, the rusty patched bumblebee,bombus affinis, that was thought to have gone extinct in that area, and was recovered by a private citizen with a digital camera."
Others though, I want to tell you that it doesn't-- if you're shopping-- I had a student come by yesterday and ask he's a little rusty in his math skills if he should take this course.
其他的,我想告诉你们不必...,如果你还在挑选课程...,昨天有个学生来问我,他的数学有点荒废了,他该不该选这门课
耶鲁公开课 - 金融市场课程节选
Rusty Lee and his family raise vegetables and livestock on his farm in Truxton,Missouri, about 100 kilometers west of St.Louis.

As it is for many people, your friendship-building skills may be a little rusty.
FORBES: A Simple Business Lesson To Improve Your Retirement Plan

(METAL) covered with rust (= metal decay)
(NEEDING PRACTICE) If a skill you had is rusty, it is not as good as it was because you have not practised it.

A rusty metal object such as a car or a machine is covered with rust, which is a brown substance that forms on iron or steel when it comes into contact with water.
If a skill that you have or your knowledge of something is rusty, it is not as good as it used to be, because you have not used it for a long time.