Quadrivalent
a. 四价的\\n[医] 四价的
✅ 同义词
🗣️ 情景例句
He's a friend.
他是位朋友。
If it doesn't rain tomorrow, we'll have a picnic.
如果明天不下雨，我们就去野餐。
We tramped through the wood for over two hours until we arrived at a deep stream.
我们在树林中跋涉了两个多小时，到了一条深溪边。