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...
The fluid can be drawn off with a syringe.可用注射器将液体汲出。To suction with a bulb syringe, push bulb in with your thumb.用球吸引器时先用拇指把球压扁.A bulb syringe is often used for oral and nasal suction on infants and children.常常使用球吸引器抽吸婴...
He cautioned us for playing in that busy street.他告诫我们不要在那条交通繁忙的路上玩.He cautioned that the Russia - American discussions were still in an exploratory stage.他警告说俄美会谈尚处于探索阶段.Citrus growers were cautioned to protect the fruit...
Embroidery calls for great care . There must not be even a single sloppy stitch.刺绣要求很高, 一针也不能马虎.It is a headache to decipher his sloppy penmanship.辨认他的潦草的字迹叫人头痛.Mother constantly picked at him for being sloppy.母亲不断地批评他衣着...