Feedback is a powerful idea which is used extensively in natural and technological systems.
反馈是一个强大的概念，在自然系统和技术系统中被广泛使用。
The great secret that all old people share is that you really haven't changed in seventy or eighty years. Your body changes, but you don't change at all. And that, of course, causes great confusion.
Certification is the grammar of responsible forestry.
愤怒的陶醉，如葡萄之醉，向他人展示我们，却对我们自己隐藏。
Writing is groping in the dark, hoping to find a light.
