use WASD and Space to move and mop the floor, and Direction key ;
使用WASD移动，空格键拖地，方向键控制朝向；
Go to the mop bucket and squeeze out the water;
走到拖把桶挤掉水分；
The game is not finished, there is no end condition;
游戏没有完成，没有结束条件；
