Polysulfones
[化] 聚砜; 聚砜类
🗣️ 情景例句
It's seventy-five cents for adults and thirty cents for children under twelve.
大人75美分，12岁以下的小孩30分。
Open your book,please.
请把书打开。
It is no matter whether you get there early or late.
你早到晚到都没有关系。