as easy as to turn one's hand;as easy as turning one's hand;at a hand's turn;can do it on one's head;[电影]Pushover;

The obliteration of the grotto was not only possible, but relatively easy.
摧毁山洞不但可能, 而且易如反掌.
来源:网络文摘精选Don't think this job a piece of cake. You'll have to rack your brains once you start on it.
别以为这工作是易如反掌的事, 你做了就知道它是很伤脑筋的.
来源:《现代汉英综合大词典》
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