Propargyl
炔丙基
🗣️ 情景例句
What are the flowers for, Richard?
究竟为什么送花 ，Richard？
When an opportunity is neglected, it never comes back to you.
机不可失，时不再来。
I think we are the first people here for hundreds of years. Maybe thousands.
“我认为几百年，可能几千年以来，我们是第一次来这里的人。”