Polymethacrylonitrile
[化] 聚甲基丙烯腈
🗣️ 情景例句
It's nice to meet you.
很高兴见到你 。
Please try to focus your attention on the speaker.
请试着把注意力集中于演讲的人。
Many firms, for instance, have great difficulty in obtaining technical or scientific books from libraries
比如，很多公司向图书馆借阅科技书籍时感到很困难，