Ed50
[医] 半数有效量
🗣️ 情景例句
He sees her often but doesn't want to get too involved.
他常与她来往，但不愿用情太深。
Sharp stomachs make short graces.
饿的肚子顾不到体面。
What did your boss say to him?
你老板是怎么对他说的？