Automotive - engine lubricating systems are of the pressure - feed type.汽车发动机的润滑系统采用压力供给式.In the present chapter, the emphasis is mainly on lubricating oils for internal combustion engines.本章着重讨论用于内燃机的润滑油.Complex calcium...
A funeral is a sombre occasion.葬礼是个忧郁的场合。Enthusiastic applause lent a sense of occasion to the proceedings...热烈的掌声给活动平添了几分隆重的色彩。The occasion requires formal dress.这场合要求穿礼服。The wedding was an occasion of great festivity.这...
原始人用石块和骨头做原始的工具.Primitive man made himself primitive tools from stones and bones.原始人很快就学会了使用工具.Primitive man quickly learned how to manipulate tools.遥远北方的爱斯基摩人是原始人.The Eskimos of the far north are primitive....
他回来时皱眉蹙额,板着脸,嘴上却快活地吹着口哨.He returned frowning, his face obstinate but whistling jauntily.檐壁上横梁中在框掾和''.'额'.''''.'板'. ''之间简易或有装饰的水平部位.A plain or decorated horizont...
Richard refused to trade in his old Canon cameras.理查德拒绝用他的旧佳能相机以旧换新。Vendors were doing a brisk trade in souvenirs.商贩们的纪念品生意很红火。the trade-in value of a car一辆汽车的以旧换新抵价...
气缸中的蒸汽膨胀并推动活塞向外运动.Steam in a cylinder expands to push a piston outward.当排气冲程开始时, 气缸被向上运动着的活塞刮掠.When the exhaust stroke starts, the cylinder is swept out by the upmoving piston.在发动机气缸里发生的动作,可以分为四个过程或冲程.The actions taking ...