Quadriad
n. 四个一组(或一套、一系列)
🗣️ 情景例句
We'd prefer a credit card, if you have one.
如果你有信用卡，我们较喜欢信用卡。
I still have some questions concerning our contract.
就合同方面我还有些问题要问。
Some of them are going to the park.
他们中有几个正走进公园。