Fd50
[医] 半数致死量
🗣️ 情景例句
He doesn't enjoy going to school.
他不喜欢上学。
I turned off when they started talking about computers.
当他们谈论计算机时，我失去了兴趣。
What's the matter, Granny? Can I help you?
什么事，老大娘？我能帮你吗？