Serotoxin
[医] 血清毒素
🗣️ 情景例句
Are you involved in any extra-curricular activities on campus?
你在学校参加过任何课外活动吗？
I don't know for sure.
我不能肯定。
How did you decide that product was safe?
你怎样决定产品是安全的呢？