当思想掌握了群众，它就成为一种物质力量。

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.

可持续发展不是一种选择；它是能源未来的必要条件。

You have to believe in yourself when no one else does.