当务之急英语短语

urgent matter

第一件事是第一

First things first 重要的事先来

应该是：事有先后首当其冲（的是）重中之重希望有帮助

What you should do now is focus on your study, and don't be distracted. You should listen to the teacher carefully in class, and review your lessons after class.

top priority

直接涉及；立即关注；意思是“当务之急”