The colts and calves are gambolling round the stockman.小马驹和小牛犊围着饲养员欢蹦乱跳.They are very careful in keeping the mares and colts away from humans.公野马总是掩护着母野马和野马驹远离人们.He plays for the colts, eg the junior team of a football c...
最普通的精加工工序是用机械的方法, 如研磨, 磨削或用磨料抛光.The most common finishing operations are mechanical, such as milling, grinding, or polishing with abrasives.实验中采用磨料磨损的方式.Abrasion wearis taken as the main wear mode in the experiments.磨料水射...