Xanthogenamide
乙黄原酰胺
🗣️ 情景例句
How many brothers and sistes do you have?
你有多少个兄弟姐妹？
How long have you studied English?
你学英语多久了？
I don't know his number. Did you write it down?
我不知道他的电话号码。你记下来了吗？