back/bæk/

ad.

➊ in, into, or to the place or situation where sb/sth was before; in or towards an earlier time

➋ in the opposite direction from the way you are facing

➌ in reply

a. near or at the part of sth that is away from the front

n.

➊ the part of your body that is opposite to the front

➋ the part of sth that is furthest from the front

ad.

➊ 回（原处、原状、过去）：Put the book back after you read it. 阅后请将书放回原处。

◇She walked back to the hotel. 她走回酒店。

◇Give me back my pen. 把我的钢笔给还我。

◇She woke up at midnight and couldn't go back to sleep. 她半夜醒来，就睡不着了。

◇[一段时间+ back] That happened several years back. 那件事发生在几年前。

◇[back +过去时间] He visited us back in 1999. 他早在1999年来看过我们。

➋ 向后：Step back to let us pass. 往后站，让我们过去。

◇He sat back on the chair. 他向后坐在了椅子上。

◇She turned and looked back. 她转过身来，向后看了看。

➌ 回复：Please call back later. 请稍后回电。

◇She hasn't written back yet. 她还没有回信。

a. [仅置于名词前] 后面的：The tallest students sit in the back row. 最高的学生坐在后排。

◇the back door后门

n.

➊ [C] 背：He lay on his back, staring at the ceiling. 他躺着盯着天花板。

➋ [C，常S] 后部：[the back of sth] They are sitting at the back of the bus. 他们坐在巴士的后面。

back

backwards

backache

background

drawback

常犯错误

✗ He has returned back.

✓ He has returned.

✓ He has come back. 他已经回来。

[✌back不与return连用]

常犯错误

✗ Sign your name at the back of the cheque.

✓ Sign your name on the back of the cheque. 在支票背面签名。

[✌此句back为“背面”之义，与at the back of sth短语中的back不同]

用法口语中多用be back替代come back。如：He'll be back from school at five. 他5点钟就要从学校回来。