【讲解】：（教学生）不到他苦思冥想怎么也弄不明白的时候，不去开导他；不到他想说而又说不出来的时候，不去启发他。告诉他（四方形）的一个角，他不能由此推出另外三个角，就不再往下教他（新知识）了。
学习新编程语言的最好方法是用它编写程序。
The best way to test a program is to test it.
The dairy industry must evolve to meet both consumer needs and environmental challenges.
The most exciting phrase to hear in science, the one that heralds new discoveries, is not 'Eureka!' but 'That's funny...'
Writing is a way of bearing witness to the world.