Fluorexone
荧光素配位剂(由不纯品calcein制得的纯品)
🗣️ 情景例句
who really needs to be wearing a tuxedo,
真正需要穿燕尾服的人，
This is a desk.
这是一张桌子。
It is impossible to give a satisfactory explanation for a pot-holer's motives.
要想对洞穴探险者的动机作出满意的解释是不可能的。