—— 请按键盘 空白键 开始游戏 ——

Rent is that portion of the produce of the earth which is paid to the landlord for the use of the original and indestructible powers of the soil.
Mathematics is a universal language that transcends cultural and linguistic barriers.
The pursuit of knowledge is a journey without end, but every step forward is a victory.
当你有一个梦想时,你必须抓住它,永远不要放手。