Vertically means that every class connected to the next class is connected to every class throughout the semester around a spiral.

纵向意味着每一节课都和下一节课有关系,和整个学期内的每一节课都有关系，呈一个螺旋状。

哈佛公开课 - 幸福课课程节选

What they argued in this paper was that, if we had perfect risk management, then there would be perfect correlation of consumption across countries because if we get rid of the idiosyncratic risks, then all that's left is planet-wide risks.

他们在论文中的观点是，如果我们有完善的风险管理,那在不同国家之间的消费呈完全相关,因为如果我们消除了特有风险，那只剩下全球范围内的市场风险。

耶鲁公开课 - 金融市场课程节选

If X is the number of cells, then the rate of change of X, dX/dt, the rate of change of the cell population, how fast division is taking is proportional to the number of cells I have.

如果X是细胞数目,那么X的改变率就是dX/dt,就是细胞数目的改变率,分裂的速度有多快,和细胞数量呈比例关系

耶鲁公开课 - 生物医学工程探索课程节选