PartⅠ Sentences Commonly Used
1.Modern metro trains normally are 6-car units，and few of them are either 8-car units or 4-car units.
现代地铁列车通常是6节车厢的列车，很少有8节车厢或4节车厢的列车。
2.The first metro train was powered by steam.However，modern metro trains are powered by electricity.
第一列地铁是由蒸汽驱动的，而现代地铁是由电力驱动的。
3.There are three types of cars in a metro train.They are motor cars with cabs，motor cars without cabs，and trailers.
地铁列车有3种类型的车厢，即带驾驶室的动车、不带驾驶室的动车和拖车。
4.The designed top speed of a metro train is 80 km/h.
地铁列车设计最高时速为80千米/时。
5.There are 3 different sizes of cars.Type A is 22 meters long，3 meters wide；Type B is 19 meters long，2.8 meters wide；Type C is 19 meters long and 2.6 meters wide.
有3种不同尺寸的机车，A型长22米，宽3米；B型长19米，宽2.8米；C型长19米，宽2.6米。
6.They have the same height.
它们高度相同。
7.The capacity of a car depends on its size.Type A has a capacity of 280 passengers and Type B can hold 260 passengers.
一辆车的容量取决于它的大小。A型车的载客量是280人，B型车的载客量是260人。
8.The weight of a metro car is about 30—40 tons，which needs four powerful electrical motors to reach its regular speed.
地铁车辆的重量为30—40吨，这需要四台强大的电机来达到它的正常速度。
9.The electricity used for metro trains is direct current at 750—1，500 volts.
地铁列车使用的电力是750—1500伏的直流电。