Hvl
[医] 半值层, 半价厚度
🗣️ 情景例句
He is on another line right now.
他正在接另一个电话。
How did you find him?
你是如何找到他的？
The dogs have greater freedom, too, for they are allowed to wander outside their enclosure.
狗也比较自由，被放出围栏，四处遛达。