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.
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。