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一、详细释义：
adj.
背部的
例句：
This is the exercise designed to strengthen the back muscles.
这是旨在加强背部肌肉的练习。
例句：
I'm having treatment for my back problem.
我正接受背部疾患的治疗。
后面的
例句：
Go to the back room. Go!
到后面的房间，走！
例句：
We came by the back road.
我们从后面的小路而来。
过去的
拖欠的
例句：
It is a good day to catch up on back reading and other assignments.
周日是用来补上拖欠的阅读任务和其他作业的好时机。
adv.
以前
例句：
How far does your memory go back?
你能回忆起多久以前的事情？
例句：
If we get back before twelve thirty, we won't be too late for lunch.
十二点半以前赶回去还吃得上饭。
向后地
例句：
Wu Sun-fu sprawled back in his seat and showed his teeth in a derisive grin.
车里的吴荪甫往后靠在车垫上，露出了牙齿狞笑。
例句：
She took a step back.
她向后退了一步。
来回地
例句：
We gently rocked back and forth.
我们轻轻地来回摇晃。
例句：
You keep pacing back and forth.
你一直在来回踱步。
上溯
例句：
The custom goes back to roman times.
这种风俗可上溯到罗马时代。
n.
后面，背面，反面 [U]
例句：
We couldn't hear the speaker at the back of the hall because her voice doesn't carry very well.
我们在大厅后面听不清演讲人讲话，因为她的声音传得不太远。
例句：
Write your address on the back.
把你的地址写在背面。
背，背部 [U]
例句：
She was injured in the back.
她背部受了伤。
例句：
He has a pain in his back.
他背部有点疼痛。
靠背 [U]
例句：
I know he's here, his coat is hanging over the back of the chair!
我知道他在这里，他的外衣搭在这椅子的靠背上！
例句：
The back of the dental chair was adjustable.
这个椅子的靠背可以调整。
（足球等）后卫 [C]
例句：
Jack is a full back of the team.
杰克是球队的后卫队员。
例句：
Philipp Lahm began his career as a right-footed left-back.
菲利普·拉姆以右脚左后卫开始他的职业生涯。
（书报等的）末尾
例句：
Go and join the back of the queue.
去站到队尾去。
例句：
Some fool drove into the back of my car.
有个傻瓜撞到了我的车尾。
v.
支持 [T]
例句：
We'll all back you up.
我们大家都支持你。
例句：
You should back me up then.
游客
