可持续性不是一种选择；它是我们共同的责任。
The very least you can do in your life is to figure out what you hope for. And the most you can do is live inside that hope. Not admire it from a distance but live right in it, under its roof.
The beauty of a mathematical proof is in its elegance and the way it reveals the underlying truth in a clear and concise manner.
诗歌不是一个封闭的领域，而是一个开放的领域，读者被邀请进入。