Hvl
[医] 半值层, 半价厚度
🗣️ 情景例句
Oh, here are my certificate of merit.
哦，这里是我的获奖证书。
Would you mind getting together sometime?
你可以找个时间大家一起聚聚吗？
People are always talking about 'the problem of youth'.
人们总是在谈论“青年问题”。