stay behind

US /steɪ bɪˈhaɪnd/
UK /steɪ bɪˈhaɪnd/
"stay behind" picture
1.

留下, 留下来

to remain in a place after others have left

:
I had to stay behind to finish my work.
我不得不留下来完成我的工作。
The teacher asked a few students to stay behind after class.
老师让几个学生课后留下
2.

落后, 掉队

to make less progress than others

:
If you don't study, you'll stay behind in class.
如果你不学习,你会在课堂上落后
The company is afraid it will stay behind its competitors if it doesn't innovate.
如果公司不创新,它担心会落后于竞争对手。