Squariance
(离差)平方和
🗣️ 情景例句
and used to play drums with the jazz band on weekends.
周末还经常在爵士乐队中打鼓。
Do you know when he will be back?
你知道他什么时候会回来？
Why does aperson standing in a bus or train tend to fall when a sudden start is made?
一个人站在公共汽车或火车上，当车突然开动时，他为什么会倾倒呢？