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键盘上下键控制方向，躲避冰块顺利过关。
Keyboard arrow keys control direction, and avoid ice smooth clearance.
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用键盘方向键控制蛇头运动方向；
The keyboard keys to control the direction snakeheads movement direction;
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用键盘方向键控制蛇头运动方向；
The keyboard keys to control the direction snakeheads movement direction;
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