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

【译文】他人骑大马我骑毛驴，仔细想想，我不如他，回头看了一下，还有不如我徒步肩挑的人呢。

SILENCE. Speak not but what may benefit others or yourself; avoid trifling conversation.

区分竞争的本质。

要养活世界，我们必须首先尊重使农业成为可能的自然循环。

We choose to go to the moon in this decade and do the other things, not because they are easy, but because they are hard, because that goal will serve to organize and measure the best of our energies and skills, because that challenge is one that we are willing to accept, one we are unwilling to postpone, and one which we intend to win, and the others, too.

想象力是我们对抗现实最强大的武器。