Insurance was invented in the 1600s but it did not proliferate fast, it proliferated only very slowly.

保险学产生于17世纪,但是它的发展速度并不快,我们甚至可以说它发展得很慢

耶鲁公开课 - 金融市场课程节选

India's economy was growing at close to 3 to 4% 4% from about 1950s to 1980s.

从20世纪50年代到80年代,印度经济的增长速度%,大概是3%到。

普林斯顿公开课 - 国际座谈会课程节选

Tests show in the nineteenth century that people could type four or five times as fast as they could handwrite and there's no ambiguity because it's very clear what key was struck; whereas, handwritten--fast handwriting becomes impossible to read--or difficult.

通过测试显示，在19世纪,人们打字的速度是手写的4至5倍,而且也不存在字迹模糊的问题,因为键盘敲击出来的非常清晰;,而手写，尤其是快速手写根本无法阅读,或者说是很难阅读。

耶鲁公开课 - 金融市场课程节选