矿业中的多样性不是可选项，而是发展的必要条件。

译文：过去的时间逝去了不可追回，今天的日子也会在转瞬之间过去。赏析：已经过去的就让它过去，不必再追悔。我们要活在当下，珍惜每一天。与其用泪水悔恨昨天，不如用汗水拼搏今天。

No society can surely be flourishing and happy， of which the far greater part of the members are poor and miserable.

Mathematics is an art, and as an artist, you have to be honest with yourself.

A good detective listens more than he speaks.

做出伟大工作的唯一方法就是热爱你所做的事。