专业英语段落翻译_专业英语重点段落翻译

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The camshaft is a rotating shaft that has lobes , celled cams , opening and closing the intake and exhaust valves in time with the motion of the piston.When the cam pushes against the lifter , the lifter in tern pushes the valve open.When the cam rotates away from the lifter , the valve is closed by a spring that is attached to the valve.the camshaft must be

synchronized with the crankshaft so that it makes one revolution for every two revolution of the crankshaft.this is a critical job, and canhave a great impact on an engine’s performance at different speeds.在活塞运动的同时，凸轮的旋转可以及时控制进气出气阀门的开启与关闭。当凸轮运动推动挺柱时，挺柱会有次序的推动阀门的开启。当凸轮旋转远离挺柱时，阀门上的弹簧会关闭阀门。凸轮轴必须与曲轴同步运转以保证曲轴每旋转两个周期凸轮轴旋转一个周期。这是一个关键性动作，并且对发动机性能在不同转速都会有很大影响。Driving a car with a manual transmiion, you depre the clutch, select a gear, and release the cultch while applying power to get the car to move.The clutch allows engine power to be applied gradually when a vehicle is starting out, and interrupts power to avoid gear crunching when shifting.Engaging the clutch allows power to transfer from the engine to the transmiion and drive wheels.Disengaging the clutch stops the power transfer and allows the engine to continue turning without force to the drive wheels.驾驶一辆带有手动变速器的汽车时，踩下离合器时，选择一个档位，当有能量输入时松开离合器使汽车运动。当发动汽车时发动机的功率会逐渐被传送到离合器，换挡时中断功率可以避免齿轮之间的摩擦声音。接合离合器，发动机的动率就会传送到变速器和驱动轮。松开离合器阻止能量的传送，并且发动机在没有能量输送到驱动轮的情况下还可以正常运转。

The rack-and-pinion gear-set does two things:It converts the rotational motion of the steering wheel into the linear motion needed to turn the wheels.It provides a gear reduction, making it easier to turn the wheels.On most cars, it takes three to four complete revolutions of the steering wheel to make the wheels turn from lock to lock(from far left to far right).齿轮齿条齿轮组有两大功能：

1.把转向盘的旋转运动转变成直线运动来控制车轮。

2.可以使齿轮减速从而更便捷地控制车轮的转向。

对于大多数的汽车，转向盘的总回圈数（从最左边到最右边）需要3-4圈的完全旋转。

Oil is circulated through the engine by an oil pump.Most oil pumps have two small gears that mesh with each other.A preure-regulator valve in the pump is used to prevent the lubrication system from reaching too high a preure.The oil pump pulls oil up from the oil pan through the pick-up screen.The screen collects any large particles of dirt so that the oil entering the pump is fairly clean.The pump then directs the oil through an oil filter, which strains any remaining dirt out of the oil;the oil entering the engine lubrication paages should be clean.机油在机油泵的作用下在发动机内循环流动。大多数机油泵有两个小齿轮来相互啮合。在泵里的调压阀阀门被用来阻止润滑系统达到高温。机油泵将机油通过机滤器吸上来。滤网可以过滤脏的小颗粒以保证进入到泵里的机油是完全清洁的。机油泵将剩下的比较脏的机油直接送到具有过滤功能的的机油滤清器内。机油进入发动机润滑系统就会是干净的了。

The following four steps show how the SRS airbag works:

1.In an impact, sensors in the car detect the sudden deceleration.If the crash is severe enough ,electricity flows to the inflator and causes ignition of the gas generator.2.The gas generator then rapidly burns in the metal chamber.The rapid burning produces inert gases and amount of dust.The inert gases and dust are cooled and filtered during inflations of the airbag.3.The inflating airbag splits open the trim cover.The airbag then rapidly unfolds and inflates in front of the occupant.4.After inflation ,the gas is vented through opening or open weave areas in the airbag.These steps take place in a fraction of a second.Airbag deflate in under a second and may be pushed aside for occupants to exit.以下四步是安全气囊的工作过程：

1.在碰撞中，汽车上的传感器感应到汽车的突然减速。如果不是很严重，电流会发出点火信号使气体发生器工作。

2.气体发生器会迅速在一个金属室内燃烧。迅速的燃烧便产生了许多惰性气体和大量灰尘。在安全气囊充气的同时这些惰性气体和灰尘会被冷却过滤。

3.充气的安全气囊会涨破装饰罩。安全气囊会迅速在乘客面前展开。

4.充气结束后，这些气体会从气囊的编制地方放出气体。这几步只发生在瞬间。安全气囊也会在瞬间放气可能还会把乘客推到外面。