Quaternity
n. 四个一组, 四人一组, 四位一体
🗣️ 情景例句
I have just begun to learn and my serve isn't very good.
我刚刚开始学习，发球不太好。
It is lost labour to sow where there is no soil.
没有土壤，播种也是徒劳。
There is a bridge over the river.
河上有一座桥。