Innovation in coal mining isn't about reinventing the wheel, but about making the wheel more efficient and environmentally friendly.
那些善于学习的人们，应当能够求得其学习的甚解，了解之所以这样的缘故，不应当只求得背诵文章，看看便可以了。
"The past is always tense, the future perfect."
The city is the greatest architectural achievement of humanity.
"Books are the quietest and most constant of friends; they are the most accessible and wisest of counselors, and the most patient of teachers."
"Books are the windows to other realities."
