There were gangs of kids on motorbikes roaming around.过去有成群结队的年轻人骑着摩托车四处游荡。Cars and motorbikes had churned up the field.汽车和摩托车在地上留下了一道道车辙."They're slow, heavy and cost a fortune."— 'So how have these motorbikes...
To be ignorant of one's ignorance is of the ignorant.每天进步一点点----不知道自己的无知,是无知者的通病.They appear to be ignorant of what is going on here.他们对这里发生的事似乎一点也不知道.She appears to be ignorant of this fact.她似乎不知道这件事实....
分析了摆动从动件盘形凸轮机构的压力角与基本尺寸之间的关系.The relationship of cam with oscillating followers pressure angle and radius of basic circle were analyzed.凸轮传动结构简单、紧凑,能方便实现从动件预期的运动规律.The structure of cam transmission is simple and compact ...