Polyacetylene
聚乙炔
🗣️ 情景例句
Frankly, I thought they'd be here, but ...
老实说 我原以为他们会在这儿 但……
There was perfect harmony between the two brothers.
兄弟俩感情非常融洽。
l am vacuuming the floor now and have several shirts to iron.
我正在用真空吸尘器清理地板，还有好几件衬衫要熨。