活塞上涂了一层石墨以减小摩擦力。The pistons are graphite-coated to reduce friction.润滑油能减小摩擦力.Oil can reduce friction.这种自行车的设计成功地减少了风的阻力和摩擦力。The design of the bicycle has managed to reduce the effects of wind resistance and drag....
Molecular chaperones are involved in a wide variety of essential cellular processes in living cells.分子陪伴未婚少女的年长妇女在活细胞里涉及多种必要的细胞代谢过程.Mentors ( teachers, parents, chaperones and other adult team - members ) are not allowed...
这机器用电力驱动.The machine is driven by electricity.可以用电力元件, 低能火焰, 紫外线或红外线辐射发热.Heat may be in the form of electric elements, lazy - flame gas, ultra - violet or infra - red radiation.如果用电力驱动旋转活塞水泵喷灌, 效果会更好.If the power - drive...