/rʌst ||; rʌst/noun
[U] a reddish-brown substance that forms on the surface of iron, etc, caused by the action of air and water 锈
rustverb [I,T]
Some parts of the car had rusted.汽车有些部位已经生锈。
rustrustrustsrustedrustingnoun (no plural)a red-brown substance that you sometimes see on metal that has been wet▶ rustverb (rusts, rusting, rusted): My bike rusted because I left it out in the rain.