The three-race series will be a curtain-raiser to the Monaco Grand Prix in May.这3场系列赛将为5月份的摩纳哥大奖赛拉开序幕。...Caroline Lindon, Princess of Monaco.摩纳哥公主卡罗琳·林登AS Monaco, Nice and Rouen in France and FC Winterthur in Switzerland...
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...