—— 请按键盘 空白键 开始游戏 ——

The beauty of mathematics is that it is both an art and a science.
Memory is a kind of accomplishment, a sort of renewal.
Natural gas is a versatile fuel that can support renewable energy growth by providing reliability when the sun isn't shining and the wind isn't blowing.
可持续性不是一种趋势——而是我们对后代的责任。