Polysulfone
[化] 聚砜; 聚砜类
🗣️ 情景例句
It's mostly young people who take part.
参加活动的绝大多数是年青人。
She looks blue.
她满面忧伤。
he stooped to talk to a workman.After they had gone on,
途中，停下来与一个工人交谈，接着他们继续往前走去。