Hamstrings are supporting muscles at the back of the thigh

Doubts were already gnawing away at the back of his mind

心底的疑团已经开始困扰他。

There is no index at the back of this book.

这本书后面没有索引。

I found some old photos at the back of the drawer.

我从抽屉尽里头找到一些旧照片。

People often think that students who sit at the back are lazy.

人们常常认为坐在后面的学生很懒。

Light refreshments will be served at the back of the hall.

会堂后面将供应简单的茶点。

Check your answers in the key at the back of the book.

用书后的解答核对答案。

Our room was at the back of the hotel.

我们的房间在旅馆靠后面的地方。

She twisted her hair into a bun and pinned it at the back of her head.

她把头发盘成一个髻，用发夹别在脑后。

There are fruit trees in front and at the back of the house.

房子前后都是果树。

We could only get seats at the back.

我们只能找到后排的座位。

The dress buttons at the back.

这件连衣裙是从后背系扣的。

A small garden sits at the back of the house.

房子的后面有个小花园。

The dress fastens at the back.

这件连衣裙是在后背系扣的。

The skirt does up at the back.

这条裙子在后面系扣。

How much are those apples at the back?

后边那些苹果什么价钱？

help sb. with sth. Can you help kids with swimming?

你能教孩子游泳吗？

I don't know how to do this work. Please help me out. ? help sb. with sth.

帮助某人解决难题，摆脱困境？我不知道怎么做这项工作，请帮我一把。

help sb with sth one's sth

帮助某人某事（某方面）

Even when I didn't have anyone to play ping-pong with.

甚至没人陪着也能打。

So we start to say if America is good at helping big companies, just like America is good at making basketball we should play ping-pong in China, we should help the small guys.

美国习惯于帮助大型企业，这就好比美国人擅长于打篮球；而在中国，我们应该会去打乒乓球，去帮助那些小公司。