piece

...a piece of cake

用：也说child's play(小儿科玩意儿)。
意：…是很容易做的事;…没什么难的;…小莱一碟;“·是轻而易举的事
例 .I need not have warx}ied about my French exam-it was a piece of cake.
我本来不必担心法语考试的，那简直容易极了。
A: How did you manage to get into the house?
你是想什么法儿进屋的?