您要查找的是不是：
- That is actually a cavity in the earth. 那其实是一个地下洞穴。
- Friction causes a rolling ball to stop finally. 摩擦力使滚动的球最终停了下来。
- Constant friction wore out the heels of my shoes. 不断的摩擦磨损了我的鞋跟。
- Friction between two sticks can create a fire. 两个棍棒相互摩擦能起火。
- A cavity or hollowed surface, especially of a bone. 腔尤指骨头的腔或凹陷的表面
- The cavity formed by this structure. 盆腔由这种骨骼结构形成的体腔
- In the absence of friction belted machinery would not be used. 没有摩擦力，皮带传动的机器就无法使用。
- I have a toothache because there is a cavity in one of my teeth. 我牙疼，因为我的一颗牙齿上有个洞。
- cavity friction 声腔摩擦
- Matches are lighted by friction. 火柴由摩擦而生火。
- There is a great deal of friction between the management and the work force. 劳资双方之间存在大量矛盾。
- A friction match with a large head capable of burning in a wind. 耐风大头火柴一种能够在风中燃烧的通过磨擦点火的大头火柴
- The peritoneal cavity is a potential space. 腹腔是一个潜在的间隙。
- The peritoneal cavity is a closed sac. 腹膜腔是一个封闭的囊腔。
- Friction lowers the efficiency of a machine. 摩擦减低机器的效率。
- A fluid-containing sac or cavity in the body of an organism. 池有机体体内一种贮存流体的液囊或穴
- A small angular cavity or pit, such as a honeycomb cell. 小窝，蜂巢小窝或小泡，如蜂房的巢室
- You could not walk if there were not some friction. 假若没有摩擦，你就不能行走。
- Yes, you have a big cavity there. 你有一个大大的蛀牙洞。
- Adhesive friction, as of a wheel on a track or a tire on a road. 附着摩擦力粘附性摩擦，如车轮在轨道上或轮胎在路面上的
