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....
工程垮掉系环境所迫。The reasons for the project collapsing were circumstantial.为饥饿所迫, 他为极少的工资而工作.Forced by hunger, he worked for the most niggardly pay.他为环境所迫而犯罪.He was forced into crime by circumstances....