Valva
[医] 瓣, 瓣膜
🗣️ 情景例句
I think I'll need your expert assistance this afternoon.
我想，我今天下午需要你专业的协助。
How long will it take for a telegram to get to California?
你把电报传到加州要多长时间？
Can I help you?
你们要点什么？