Sustainability is not an option; it's a necessity for the future of mining.

建筑是将自然转化为文化的人类行为。

唯一能阻止你的人是你自己。

We are all wanderers on this earth. Our hearts are full of wonder, and our souls are deep with dreams.

Liberal democracy may constitute the "end point of mankind's ideological evolution" and the "final form of human government."

政策规则优于自由裁量，因为它们避免了时间不一致性问题。