Unit汽车专业英语(变速器)资料.ppt

be classified into…. ①分类为、被分成 Memory can?be classified into?short-term and long-term memory. 记忆可分为长期记忆和短期记忆。 II. Text Explanation Reading How an Engine Works “Stroke” refers to piston movement; a stroke occurs when the piston moves from one limiting position to the other. “冲程”指的是活塞的运动。当活塞从一个极限位置移动到另一个极限位置，即完成了一次冲程。 Reading The upper limit of piston movement is called TDC(top dead center). The lower limit of piston movement is called BDC(bottom dead center). A stroke is piston movement from TDC to BDC or from BDC to TDC. 活塞运动的上极限位置被称为TDC（上止点）。 活塞的下极限位置被称为BDC（下止点）。 一个冲程是指活塞从上止点运动到下止点或者从下止点运动到上止点。 Reading In other words, the piston completes a stroke each time it changes its direction of motion. 换句话说，活塞每完成一次冲程就会改变运动方向。 In other words In other words, they remain relatively constant or static.? 换句话说，它们相对的稳定、静止。 In other words, we have adhered to scientific socialism.? 也就是说，我们坚持了科学社会主义 Reading Where the entire cycle of events in the cylinder requires four strokes (or two crankshaft revolutions), the engine is called a four-stroke-cycle engine. The four piston strokes are intake, compression, power and exhaust. 气缸内的全部循环运动需要四冲程（或称为二次曲轴转动），这种发动机称为四冲程循环发动机。活塞的四冲程分别为进气行程、压缩行程、做功行程和排气行程。 Reading Intake stroke. On the intake stroke, the intake valve has opened, the piston is moving downward, and a mixture of air and vaporized gasoline is entering the cylinder through the valve port. The mixture of air and vaporized gasoline is delivered to the cylinder by the fuel system and carburetor. Vaporized [‘ve?p?ra?zd] adj. 汽化的 carburetor [,kɑ?bj?‘ret?] n. 汽化器 Reading On the intake stroke, the intake valve has opened, the piston is moving downward, and a mixture of air and vaporized gasoline is entering the cylinder through the valve port. “在进气行程中，进气门打开，活塞向下移动，可燃混合气通过进气门进入气缸。 Reading The mixture of air and vaporized gasoline is delivered to the cylinder by the fuel system and carburetor. 适当浓度的可燃混合气是由燃料系统和化油器提供的。 Compression stroke. After the piston reaches BDC