Balljoint
n. (肩,膝等的)球状关节, 杵臼关节
🗣️ 情景例句
My professor will grade this exam on a curve.
我的教授用曲线系统打分。
None of my business.
不关我的事。
Not all sounds made by animals serve as language.
动物发出的声音不都是用作语言交际。