Olefin
n. 石蜡, 烯烃\\n[化] 烯烃
🗣️ 情景例句
It's dangerous to leave your children along while you go shopping.
购物时，把你的孩子单独留在家里是挺危险的。
Have you send him any pencils?
你送他铅笔吗？
I'm sorry, these 2 books are 3 days overdue.
小姐，对不起，这两本书已经过期3天了。