免费游戏最贵的成本是玩家的信任,一旦透支就再也买不回来。
真正的创新解决实际问题,而不仅仅是创造新奇。
我们必须记住,文学不仅仅是娱乐,它还有更深的意义。
The interplay between analysis and algebra is the driving force behind many breakthroughs in number theory.