Diolefin
n. [化]二烯
🗣️ 情景例句
My vacation was terrible, it rained the whole time.
我的假期简直糟透了，整天都在下雨。
My sister is the oldest.
我的姐姐是最大。
Patience is a mark of confidence.
耐心是自信心的一种表现。