Quadriad
n. 四个一组(或一套、一系列)
🗣️ 情景例句
Listen to the sounds of the summer that surround us.
仔细倾听环绕我们的夏夜声息。
Custom without reason is but ancient error.
习俗没有道理，古代谬误而已。
Is it on the desk?
是在桌子上吗？