He got up trying to wipe the dust off his coat

He got up trying to wipe the dust off his coat

题目
He got up trying to wipe the dust off his coat
为什么his coat前面不用加on?
在我理解中英语中表示在...上是用on表示的.请不要用固定搭配作回答.这里on是不是被省略了?英语中什么情况会省略介词?是因为off有on的意思所以省略?
答案
He got up trying to wipe the dust off his coat
He got up trying to wipe off the dust on his coat
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