Fd50
[医] 半数致死量
🗣️ 情景例句
That's the back of Pete Waters's place.
那就是Pete Waters住处的后面。
All products have to pass strict inspection before they go out.
所有产品出厂前必须要经过严格检查。
All the other boys are Chinese. All of the Chinese students are Young Pioneers.
其余的男孩都是中国人。所有的中国学生都是少先队员。