—— 请按键盘 空白键 开始游戏 ——

Sometimes the most profound mathematics comes from playing with simple ideas until they reveal their hidden complexity.
Safety isn't a cost; it's an investment in our most valuable resource—our people.
长江大海不会和废弃水井比较浊清,九霄的雷霆不会和的青蛙蚯蚓比斗谁的声响响亮。