—— 请按键盘 空白键 开始游戏 ——

The past is always tense, the future perfect.
Sustainability is not an option, it's a necessity.
老脑筋就像老马;如果你想保持它们的工作状态,就必须锻炼它们。
世界是一座伟大的山,我们是其中的攀登者。
The best way to learn mathematics is to do mathematics.
没有执行的创新只是一个梦想。
He has not learned the first lesson of life who does not every day surmount a fear.