Kera
abbr. keratinase 角蛋白酶
🗣️ 情景例句
and remember the meaning of Thanksgiving.
来追忆一下感恩节的意义。
I may be the first.
说不定我得第一。
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。