The great challenge of our time is to create a world order that is both just and sustainable.
我们这个时代的巨大挑战是创建一个既公正又可持续的世界秩序。
The hardest thing to explain is the glaringly evident which everybody had decided not to see.
今天的美好时光,就是明天的悲伤回忆。
The division of labour, so far as it can be introduced, occasions, in every art, a proportionable increase of the productive powers of labour.