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英语
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The o____ of the new machine is hard to learn
____填什么?
人气：200 ℃ 时间：2020-02-05 08:05:35
解答
The operation of a new machine can be hard to learn.
operation:[ ˌɔpə'reiʃən ]
n.手术,行动,活动,操作
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