Quadricovalent
四配价的
🗣️ 情景例句
I can believe that. One good thing about ping pong is that it doesn't need much space.
我几乎不敢相信。乒乓球最大的好处是不占地方。
His presence in the room was not noticed.
没有人注意到他在房间里。
What's your name, please?
请问您叫什么名字？