on your mark
做好准备；开始
口语·比赛或任务开始前
英文释义
to be ready or prepared to start something
例句
On your mark, get set, go! The race is about to start.
典故来源
源自赛跑或比赛中的起跑指令，裁判喊“各就各位”后选手准备出发。