Fluorexone
荧光素配位剂(由不纯品calcein制得的纯品)
🗣️ 情景例句
I don't know how to solve the problem. Will you help me out?
我不知道该怎么解决这个问题。你能帮我吗？
You are useless!
你真没用！
What colour are you going to paint it?
你打算把它漆成什么颜色？