rusting ['rʌstɪŋ]

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附加级

n.生锈v.（使）生锈( rust的现在分词 )

There was an old rusting bolt on the door. 门上有一个生锈的旧门闩。来自辞典例句
Zinc can be used to cover other metals to stop them rusting. 锌可用来涂在其他金属表面以防锈。来自辞典例句