最大的谜团是我们自己创造的谜团。

The mining industry must evolve to meet the demands of a changing world.

The man who is fit to handle pig iron is not fit to handle the management of pig iron.

My life has no direction, no aim, no meaning. And yet I'm happy.

数学的美在于它的简洁性和普遍性。

人体是最复杂的谜题，而医学是我们解决它的方式。