Valnllae vasorum
[医] 血管瓣
🗣️ 情景例句
He takes things too seriously.
他看待事情太认真了。
You'll be on air in two minutes.
两分钟以后你会上电视。
Wu dropped his stick! He stopped to get it and of course fell behind.
吴的接力棒掉地了！他停下捡棒，当然就落后了。