jump at once

• 立即行动

jump at once的用法和样例：

例句

1. As soon as the plan is mapped out,he jumps at once.
   计划一制订好，他就立即行动起来了。
2. He watched Cochran go down, and suddenly he moved, throwing himself at the dark-haired dead man.
   看到柯克兰倒下，他立即行动起来，将身体朝黑发僵尸撞去。