Fluoram
二氟化铵
🗣️ 情景例句
and cheese sandwiches for lunch.
和起士三明治当午餐。
This material feel hand, How does that materoal feel?
这种布料感觉起来很硬，那块料子如何呢？
I'm sorry to have bothered you.
对不起，打扰你了。