Break a leg: Good luck!
(Example: "I hope you break a leg in your audition.")
Break a leg 意味：幸運を祈ります、頑張れ
A piece of cake: Something very easy.
(Example: "That math problem was a piece of cake.")
A piece of cake 意味：朝飯前、余裕のよっちゃん、簡単
Kill two birds with one stone: Accomplish two things with a single action.
(Example: "By going to the grocery store, I can kill two birds with one stone and pick up my prescription as well.")
Kill two birds with one stone. 意味：一石二鳥
Kill two birds with one stone.
Break a leg:
A piece of cake:
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