Ed50
[医] 半数有效量
🗣️ 情景例句
Will there be chicks at the party tonight?
今天的晚会上有女孩儿吗？
Did you go to the store yesterday?
你昨天去商店了吗？
Excuse me! Is this your pencil-box?
请问，这是你的铅笔盒吗？