Allenes
二烯烃
🗣️ 情景例句
Sure. I will. You can count on that.
我一定会。
What do you do for relaxation?
你做什么消遣？
My teacher never spoke English like that! The porter and I looked at each other and smiled.
我的老师从来不那样讲英语！我和搬运工相视一笑。