/bæk/
向后；回到原处
toward the rear; to a previous position or condition
背部；后面；背面
the rear surface of the human body; the opposite side from the front
支持；后退
to support; to move backward
come back
回来
back and forth
来回地
go back
回去；追溯
She looked back and waved.
她回头看了一下，挥了挥手。
He has a pain in his back.
他背部疼痛。
I'll back your decision.
我会支持你的决定。
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