as easy as rolling off a log [æz ˈi:zi æz ˈrəʊlɪŋ ɔf ə lɔɡ]

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极其容易

This job is as easy as rolling a log.这个工作极其简单。
To me it looked easy,simple as rolling off a log.在我看来这件事很容易，像滚动一根圆木那样简单。