您要查找的是不是：
- What is the function of the back flow valve? 逆止阀的功能是什么?
- Capacitance vessels constrict, increasing the back flow of venous blood. 容量血管收缩;静脉回流量增加.
- Everyone needs a pat on the back now and then. 每个人都需要不时地得到鼓励。
- Three people can sit in the back of this car. 这车的后座可坐3个人。
- Have you stuck down the back of the envelope? 信封背面开口处贴牢了吗？
- He had put up a basket on a pole in the back yard. 他在后院一根柱子上安一个球篮。
- She took a seat in the back and watched. 她在后排找了一个座位坐下看起来。
- The roof slopes towards the back of the house. 屋顶向屋子的背面倾斜着。
- I can open the back gate at midnight. 午夜的时候我可以打开后门。
- I got him on the back of the head with a crowbar. 我一撬棍打在他头的後部。
- He leant on the back of the sofa. 他斜靠在沙发的背上。
- I was out in the back yard splitting logs. 我那时正在后院劈柴。
- She coiled her hair at the back of her head. 她把头发盘在脑后。
- Speak up, we can't hear you at the back. 大声说，我们在后面听不见你。
- Does this sash tie in front or at the back? 这腰带是在前面打结还是在後面？
- The back axle of the bus was broken. 公共汽车的后轴断了。
- The players at the back aren't keeping time. 后面的演奏者没有跟上拍子。
- The index is at the back (of the book). 索引在(书的)末尾。
- Shall I use the clipper on the back? 要不要我用理发推子理后面的头发？
- You push from the back and I'll pull at the front. 你在後面推，我在前面拉。
