【词组解析】
1. back of 在...后面
（1）Children were crammed into the back of the car. 孩子们被塞进了车子的后座。
（2）He is loading the goods into the back of the car. 他正把货物装入车的后部。

2. back up 支持；堵塞；复制；往后退；<篮球>协防，补防
（1）The bus had to back up and turn around. 那辆公共汽车不得不先往后退,然后再掉头。
（2）Clogged pipes caused drain water to back up into the room. 水管堵塞,排出去的水倒灌入室。
（3）To back up tiles is tedious work. 把文档备份是一项枯燥无味的工作。
（4）Why didn't you back up? I would have come and helped you.你为什么不叫? 不然我早就来帮你忙了。

3. bare of 几乎没有,缺乏
（1）The mountaintops were bare of any vegetation. 那些山顶上光秃而无任何植物。
（2）The old lady lived in a small room bare of furniture. 这位老太太住在一间无家俱的小房间里。
相关解析：bare
           adj. 光秃秃的；（房间、柜子等）空的；赤裸的；刚好够的
           vt. 使赤裸；使露出；揭开；脱（衣服）

4. be able to do 能够
（1）I cannot do it; not but what a younger man might be able to do it. 我不能做, 但也许年轻一点的人能做。
（2）" I don't know,'said Carrie . " I just don't seem to be able to do it. "“ 我也不知道, "嘉莉说, " 我好像演不上来了”。

5. be around 差不多
（1）We need to watch out here. Some dangerous gunners are said to be around this area.
      我们必须提高警惕. 据说这一带有危险的枪手出没。
（2）Its most ardent admirers would say that it will be around forever. 
     喜欢它的人则说它是要一直沿用的。

【练习】
英译中
（1）He inflicted a heavy blow on the back of her head.
（2）The path leads to a hill bare of vegetation.
（3）The stock will go back up within a week because the bank is sound.
（4）Robots need some human features in order to be able to do human work.
（5）See you soon, I expect I'll be around.