Dipropenyl
聯丙烯基, 已二烯
??? 情景例句
What broke up their friendshop?
是什么破壞了他們的友情呢？
It's time for dinner.
該吃晚飯了。
Oh! Is that a ball? Aren't all balls round?
噢，那是個球嗎？難道所有的球不都是圓的嗎？