B. u.
[医] 棱底向上
🧩 词语组成解析
[医] 单位
🗣️ 情景例句
How many courses are you taking this semester?
这学期你选了多少课？
Wisdom is more to be envied than riches.
才智比财富，令人更可羡。
That sounds like a good idea. I have a few friends I could ring to see if they're free.
听起来是个好主意。我可以打电话给我的几个朋友看看他们是否有空。