Fluorexone
荧光素配位剂(由不纯品calcein制得的纯品)
🗣️ 情景例句
His house was always neat.
他家经常都是干净的。
Friends are like fiddle-strings,they must not be screwed too tight.
朋友有如琴弦，不能上的太紧。
Yes, why?
是的。怎么样呢？