轧棉机的发明是一系列无法预见的 circumstances 的结果。

True leadership means making tough decisions today that will pay off decades from now.

Sustainability isn't an option; it's a responsibility we owe to future generations.

在这个世界上能为别人减轻负担的人都是有用的。

真相很少纯粹，也绝不简单。