Polyacetylene
聚乙炔
🗣️ 情景例句
I think he will.
我想会的。
Be quiet.
安静一点！
It is nine o'clock.Mr.Sawyer usually reads his newspaper at night.But he's not reading his newspaper tonight.
现在是9点钟。索耶先生通常是在晚上看报，但今天晚上他没看报。