以前都是坐高铁回去的，现在坐绿皮火车，因为他算过账，他的一天时间，不值那个差价。
To what extent has consumer downgrading reached?
I have a friend who used to always take the high-speed rail home, but now he takes the “green-skin” slow trains. He did the math and realized that a day of his time simply isn’t worth the price difference anymore.
