整个程序应包括几个大的模块，即游戏的围墙、蛇身、蛇的移动和食物的随机分布，每个模块又包含具体功能的实现。除了主体部分外，程序还包括游戏辅助说明部分和游戏难度选择功能的实现。-The entire program should include several large modules, namely game fences, snake, snake movement and random distribution of food, each module also contains the i