Every action has its pleasures and its price.
每个行为都有它的乐趣和它的代价。
模形式的算术是理解数论更深层次结构的关键。
A writer is a person who is obsessed with language, with words, with the power of words to create worlds.
可持续性不仅仅是一个流行词,它是未来森林必须赖以发展的基础。