Keep sb on their toes

• 保持警觉

Keep sb on their toes的用法和样例：

例句

1. She is always on the alert for some new calamity.
   她总是保持警觉以防某种新的灾难。
2. In a lotus posture you can keep alertness to the very end.
   以莲花坐的姿势你就能保持警觉直至最尽头。