Sustainability isn't an option—it's a responsibility we owe to future generations.

Profit and sustainability must walk hand in hand; one cannot long exist without the other.

Handy measure: the distance between your fingertips of your outstretched arms at shoulder level is your height.

Every book is a quotation; and every house is a quotation out of all forests, and mines, and stone quarries; and every man is a quotation from all his ancestors.

理解计算的极限与理解数学的极限同样重要。