lie behind

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

隱藏在背後, 是...的原因

to be the real reason or explanation for something

:
The true motives lie behind his sudden resignation.
他突然辭職的真正動機隱藏在背後
What lies behind their decision to move?
他們搬家的決定背後是什麼?