On your marks!

例句：

1. 1. The race is starting, so everyone on your marks!
   比赛开始，大家准备就绪！
2. 2. We're all set for the picnic, just make sure you have your hats on.
   我们为野餐准备好了一切，只需确保你们戴好帽子。
3. 3. The teacher gave us a final check before we left the classroom, on your marks!
   老师在我们离开教室前给我们做了最后的检查，准备就绪！