Pentavalency
五价
🗣️ 情景例句
We have a baby now.
我们现在有一个小宝宝了。
A horse that will not carry a saddle must have no oats.
不愿加鞍的马，不得吃燕麦。
Well, Lucy is wearing blue trousers and a blouse.
恩…，露茜穿着一条蓝裤子和一件衬衫。