Polysulfones
[化] 聚砜; 聚砜类
🗣️ 情景例句
You've really been keeping an eye on quality.
你们的确在质量上下了功夫!
I think gray hair makes you look rather distinguished.
我觉得你灰白的头发使你看上去很严肃。
OK. When?
行啊。什么时候？