Polyacetylene
聚乙炔
🗣️ 情景例句
Where there's a will, there's a way.
有志者事竞成。
I'm playing ping-pong downstairs.
我在楼下打乒乓球。
We always enjoy ourselves, Mum.Bye-bye.
我们总是玩得很开心的，妈妈。再见。