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- Having the back showing or in view of the observer. 背面的显露出背面的或背对观察者的
- Friction causes a rolling ball to stop finally. 摩擦力使滚动的球最终停了下来。
- They sent her there as an observer. 他们派她去那做观察员。
- 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。
- 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。
- friction observer 摩擦力观测器
- The driver is a poor observer of speed restrictions. 这个司机是个不遵守速度限制的人。
- 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
- A person stationed in a given location as a spy or an observer. 间谍作为间谍或观察者处在给定位置的人
- Friction lowers the efficiency of a machine. 摩擦减低机器的效率。
- You could not walk if there were not some friction. 假若没有摩擦，你就不能行走。
- 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
- A controller, not an observer of events. 事件的支配者，而不是旁观者
- Friction gradually caused the sliding box to slow down and stop. 摩擦力使向下滑的箱子渐渐慢下来后停住。
- Each observer's prediction has been borne out. 每个观察者的预料已被证实了。
- There is some friction among the family members. 家庭成员间有些摩擦。
- Two official observer attend the meeting. 两个官方观察员参加了会议。
