Polyacetylen
聚乙炔; 聚乙炔
🗣️ 情景例句
How many courses are you taking this semester?
这学期你选了多少课？
Yes, there is. We can give a 5% discount for orders over 5,000 units.
是的，有折扣，超过5000个我们可给5%的折扣。
Because my father found work in Paris.
因为我父亲在巴黎找到了工作。