Polyacetylen
聚乙炔; 聚乙炔
🗣️ 情景例句
And have a good stay in the Big Apple.
祝您在纽约愉快。
I am honored by the invitation.
承蒙招待，深感荣幸。
We have all experienced days when everything goes wrong.
我们大家都有过事事不顺心的日子。