Polydiolefin
聚二烯烃
🗣️ 情景例句
You would be well-advised to book in advance.
你还是提前预订较为稳妥。
How is the weather today?
今天天气如何？气温多少度？
After the party. Ann feels very happy.
聚会之后，安感到非常愉快。