Icosane
二十碳烷
??? 情景例句
What classes are mandatory for your major?
你的專業(yè)什么課是必修的？
The burden on likes is cheerfully borne.
愛挑的擔(dān)子，就愉快輕松。
Don't do that.Give it to me.
不要放在那兒，把它給我。