PartⅡ Sample Dialogue
A：Lin，do you know we just have some new metro vehicles arrived for this line?
B：Really?How many?
A：4 trains.Every train has 6 cars and trailers.
B：What are the differences between cars and trailers?
A：The biggest difference is that a car has an electric motor and a trailer doesn't.
B：What type are they，do you know?
A：I have no idea.I am going to find out later.
B：I hope we can get more trains with more units for this line.
A：Why?
B：Do you know that the extended line will be in operation by the end of this year?
A：Yes，that is why we have those trains here.They are ready for the upgraded line.
B：Have you noticed that the traffic of this line is increasing recently?
A：Yes，I have.You are right.We do need more trains with bigger size.
B：Let's go to find out what size they are.
对话
A：林，你知道我们刚为这条线路准备了一些新的地铁车辆吗？
B：真的吗？多少列？
A：4列。每列车有6节车厢和拖车。
B：动车和拖车有什么区别？
A：最大的区别是动车有电动机，而拖车没有。
B：你知道它们是什么型号的吗？
A：我不知道，我回头查查。
B：我希望这条线路能有更多带更多车厢的机车。
A：为什么？
B：你知道延长线将在今年年底投入使用吗？
A：知道。那就是我们这里多了这些车辆的原因。它们已经为升级的线路做好了准备。
B：你注意到这条线路最近的运载量在增加吗？
A：是的，注意到了。你说得对，我们确实需要更多更大尺寸的车辆了。
B：我们去看看它们的尺寸呢。