The saying that a little knowledge is a dangerous thing is, to my mind, a very dangerous adage.  

In the realm of algorithms, efficiency is not merely a measure of speed, but a profound statement about the nature of the problem itself.

Critical comments by students should be taken in a friendly spirit， accumulation of material should not stifle the student’s independence.

We don't just mine coal, we power the nation.

It seems to me that the natural world is the greatest source of excitement; the greatest source of visual beauty; the greatest source of intellectual interest. It is the greatest source of so much in life that makes life worth living.

天然气将在向低碳未来过渡的过程中扮演关键的桥梁燃料角色。