Polyacetylene
聚乙炔
🗣️ 情景例句
Mainly for the sports meet and also for sightseeing, I think.
主要是来参加运动会，我想也是为观光而来。
Where love fails,we espy all faults.
爱情一失败，一切毛病都发现。
In a few minutes he returned with my bag and gave it back to me.
一会儿工夫他拿着我的提包回来了，把它还给了我。