Polysulfones
[化] 聚砜; 聚砜类
🗣️ 情景例句
Hello, I would like to speak to ..., please.
喂， 我想找一下……
Well, I think it's time we get back to business.
哦，我认为我们该回到正题上了。
Are there any flowers in the picture?
画里面有花吗？