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....
这些真菌在它们的横壁中是具简单孔的横隔膜的.These fungi are septate with simple pores in their cross - walls.拉尔夫抓住了要领,运用横隔膜的气往贝壳里猛送.Ralph grasped the idea and hit the shell with air from his diaphragm.人世间相距最远的两点,是两颗隔膜的心.The most remote two po...