Polyacetylene
聚乙炔
🗣️ 情景例句
The Thanksgiving Day parade is always such great fun.
感恩节的游行总是如此有趣。
Better be half hanged than ill wed.
与其成怨偶，不如守单身。
I'm not sure. It was difficult to see. Wei Hua and Sun Meiying were both neck and neck.
我不敢肯定。很难说。魏华和孙美英不分上下。