In land animals, saliva contains mucus, and provides lubrication for food in the alimentary canal.陆上动物的唾液内有粘液, 并对消化道内的食物起着润滑作用.In metal lubrication two distinct regions are recognized: boundary and hydrodynamic.在金属的润滑作用中...
Lubrication reduces noise and wear.润滑作用能减少噪音和磨损.We shall require more lubrication oil this month.这个月我们需要更多润滑油.Sludge can also clog oil passages and prevent normal engine lubrication.油泥还会阻塞油路,妨碍发动机的正常润滑工作....
He would try to grope her breasts and put his hand up her skirt.他会试图摸她的胸部，还把手从她的裙子上向上移。The great Greek grope growers grow great Greek grapes.这个伟大的希腊葡萄种植者种植了伟大的希腊葡萄.I grope for the light switch in the dark room.我在黑洞洞的屋里摸索...