translation.en: And I'd like to share some experience over the last 40 years -- we celebrate our fortieth anniversary this year -- and to explore and to touch on some observations about the nature of sustainability.
translation.zh: 我想与大家分享一些经验 过去40年- 今年我们庆祝我们的40周年-- 一起来讨论和接触一些关于 持续的本质的观察。