Isoolefine
异烯烃
🗣️ 情景例句
Well, that's easy.
哦， 那很简单。
He's behind the rest of the class in reading.
他在阅读方面不如班上的其他同学。
As the floods had put the telephone out of order, we could not find out how they were managing.
由于洪水造成了电话中断，我们无法了解他们情况。