back/bæk/

adv

1. 原地；回原处；呈原状

• I'll be back at five. 我5点钟回来。

• I just couldn't get back to sleep. 我无法重新入睡了。

2. 以前，回

• look back on one's youth 回顾自己的青年时代

• If I'd known three years back that stocks were going to crash，I'd have sold everything. 如果三年前我知道股票要跌的话，我会把所有的股票都卖掉。

3. 倒回

• Play the tape back, let's listen to the song again. 把磁带倒回去，让我们再听一遍这首歌。

4. 往回

• Jack glanced back to see if he was still being followed. 杰克往后瞥了一眼，看看是否还有人跟踪。

5. 还；回

• hit back 还击

• Can you ask Mr Clark to call me back? 你能让克拉克先生给我回电话吗？

6. 处于被箝制状态

• hold back a laugh 忍住笑

• Stay well back! Let the ambulance through. 站开点儿!让救护车过去。

词组back and forth 来回地；反复地

• He paced back and forth in the waiting room. 他在候诊室里来回踱步。

go back on one's promise(或agreement等) 不遵守诺言，背弃协议

• The boy's father told him not to go back on his promise. 男孩儿的父亲告诉他不要背弃自己的诺言。