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...
墙上被人用喷漆涂得乱七八糟。The walls have been horribly vandalized with spray paint.墙壁被用喷漆喷得一塌糊涂。The walls had been horribly vandalized with spray paint.教授年轻人如何给汽车喷漆和修理护栏。The youths are taught how to spray paint cars and mend fences....
Anyone will help you when you meet with difficulties.你有困难时谁都会帮助你.Finally he overcame the auditory difficulties by three years' efforts.通过三年的努力, 他最终克服了听觉中的困难。It is difficulties that show what men are.----Epictetus困难方...
The school offers after-hours childcare.学校提供课后托管孩子的服务。Both partners shared childcare.这对伴侣分担照看孩子的责任。childcare facilities for working parents为职业父母提供的照管儿童的设施...