Diolefins
二烯属; 二烯属烃
🗣️ 情景例句
let you and I talk about it.
我们就来讨论一下。
It's hot this afternoon.
今天下午很热。
He believed that everyone should be prepared to do heavy work, from the leaders to the poorest peasants.
他认为从领袖到最穷苦的农民，每个人都该乐于从事重体力劳动。