Polyacetylene
聚乙炔
🗣️ 情景例句
I'd like to have you meet my foreman--
我希望带你去认识工头，
It's a matter of life and death.
事关生死。
Let us get down to fundamentals and agree that the young are after all human beings -- people just like their elders.
承认青年人和他们的长辈一样也是人。