lie behind

US /laɪ bɪˈhaɪnd/
UK /laɪ bɪˈhaɪnd/
"lie behind" picture
1.

隐藏在背后, 是...的原因

to be the real reason or explanation for something

:
The true motives lie behind his sudden resignation.
他突然辞职的真正动机隐藏在背后
What lies behind their decision to move?
他们搬家的决定背后是什么?