1.副词

向后；往后；往回

She pushes back her chair and stands. 她把椅子往后一推，站了起来。

回到原处

Smith changed his mind and moved back home. 史密斯改变主意，搬回家了。

I'll be back as soon as I can.我会尽快回来。

恢复原状；回到原来的状态

The rail company said it expected services to get slowlyback to normal.铁路公司表示，其运输服务将慢慢恢复正常。

归还；交还；放回；收回

You'll get your money back. 钱会还给你的。

回应（来信、电话、目光等）

If the phone rings say you'll call back after dinner.如果有电话打来，就说你吃完饭再回电话。

再次流行；再度成为潮流

Short skirts are back. 短裙又流行起来了。

在一段距离之外

Keep back from the edge of the platform. 请勿靠近站台边缘。

收拢；拢起；束起

Her hair was tied back. 她的头发扎了起来。

The curtains were held back by tassels.窗帘用穗子拢了起来。

（舒适地）向后仰

She leaned back in her chair and smiled.她靠在椅背上，微笑起来。

回头，转身（看或喊）

Nick looked back over his shoulder and then stopped,frowning. 尼克回头看了看，又皱着眉头停了下来。

以前；过去；追溯至

The story starts back in 1950, when I was five. 故事可以追溯到1950年，那时我才5岁。

回想；回忆

I thought back to the time in 1975 when my son wasdesperately ill. 我回想起1975年我儿子病得奄奄一息的那段时间。

来回；往返

He paced back and forth. 他来回踱步。

2.名词

背（部）；后背；脊背

She turned her back to the audience. 她转过身背对着观众。

Three of the victims were shot in the back.其中三名受害者背部中枪。

后面；后部

She raised her hands to the back of her neck. 她举起双手放于颈后。

Her room was on the third floor, at the back. 她的房间在三楼靠后的位置。

3.形容词

后面的；后部的

He opened the back door.他打开了后门。

Ann could remember sitting in the back seat of their car.安记得自己坐在他们车的后座上。

（椅子或沙发的）靠背

There was a neatly folded pink sweater on the back of thechair.椅子的靠背上搭着一件叠得整整齐齐的粉色毛衫。

（纸、信封等的）反面，背面

Send your answers on the back of a postcard.将答案写在明信片背面寄出。