Polyacetylene
聚乙炔
🗣️ 情景例句
The wedding ceremony is about to begin.
婚礼就要开始了。
The last person to introduce is Miss Caroline Norris.
最后一位要介绍的是卡萝琳.诺丽丝。
It's very hot. It's summer in Australia now!
很热。澳大利亚现在正值夏天！