Valvulae venarum
[医] 静脉瓣
🧩 词语组成解析
[医] 瓣, 瓣膜
🗣️ 情景例句
Will you be so kind as to help me out of the difficulty?
帮助我克服困难，好吗？
I don't know how to do that.
我不知道该怎么打。
Last summer, I went to Italy.
去年夏天，我去了意大利。