Quadriad
n. 四个一组(或一套、一系列)
🗣️ 情景例句
I want to buy a sleeper ticket to New York.
我想买张到纽约的卧铺票。
Which country do you come from?
你从哪一个国家来？
I knew that my turn had come.
我知道这次该轮到我了。