求翻译：In Open Pit Mining, you can steer and control the large bucket-wheel excavator, and excavate earth. There are 5 available function groups, via which the excavator is controlled. Each of the function groups can be activated by clicking the arrows of the virtual joystick, dedicated keyboard keys, or the buttons of a game controller connected to your PC. The speed of the digger movements can be adjusted in the Speed Panel at the top of the screen. Speed controls must remain in the safe zone (green) while the excavator is in operation. Otherwise the bucket-wheel could get stuck, the engine shuts down, and you receive Point Deductions.是什么意思？

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