at the back of something, often hidden
The sun was hidden behind the clouds.
太陽被雲層遮擋住了。
falling short of progress or schedule
We're behind schedule because of the delay.
由於延誤,我們落後於計畫了。
supporting or approving of someone or something
Her family was right behind her decision.
她的家人完全支持她的決定。
responsible for the creation or development of something
She was the mastermind behind the successful project.
她是成功項目背後的策劃者。
in the past, no longer a concern
The mistake is behind you, don't dwell on it.
錯誤已經過去,不要糾結了。
further back or at the back
She walked behind the line of trees.
她走在一排水的後面。
remaining in a place after others have left
Her keys were left behind on the table.
她的鑰匙忘在桌子上了。
later than the due date or expected time
He is behind in his payments.
他拖欠付款了。
a polite way to refer to someone's buttocks
He sat down hard on a rock and hurt his behind.
他重重地坐在石頭上,傷到了臀部。