Olefination
烯化作用, 成烯作用
🗣️ 情景例句
He was my roommate in college.
他是我大学时的室友。
I ought to make a phone call.
我应该打个电话。
Only the Earth provides ideal conditions, and even here it has taken more than four billion years for plant and animal life to evolve.
只有地球提供理想的条件，而即使在这里，植物和动物的进化也用了40亿年的时间。