a type of toy motor commonly found in toy cars and other vehicles, where the motion of the toy is generated by the friction between the wheels and the surface it moves on, without the need for batteries or external power sources
语法信息
有生性状态
无生命
形态构成
复合词
可数
复数形式
friction motors
例子
The friction motor in this robot makes it move across the table without needing batteries.
