Joke Collection Website - Talk about mood - Lesson Five, Zhan Tianyou. The second question after class, with the help of herringbone illustrations, talks about the method of climbing steep slopes by trains (about 300 words).

Lesson Five, Zhan Tianyou. The second question after class, with the help of herringbone illustrations, talks about the method of climbing steep slopes by trains (about 300 words).

When the northbound train arrives at the south exit, two locomotives are used, one pulling in front and the other pushing behind. Pull a, push B. When you get to the herringbone fork, turn back along the mountain. The original locomotive B is pulling now, and the original locomotive A is pushing now, so it is much easier for the train to go north and south.

Sorry, that's all I can think of. I don't know if you can use it.