Instead of listening to the cry of agony they listen to the ring of dollars and stoop down and pick up the coins."
怨言绕耳过,硬币叮当落,速拾不嫌多"
耶鲁公开课 - 美国内战与重建课程节选
Benzene is a ring that's made up of six carbon atoms and six hydrogen atoms.
苯环是一个由六个碳原子,和六个氢原子组成的环。
麻省理工公开课 - 化学原理课程节选
应用推荐
模块上移
模块下移
不移动