It is important for us to know and remember some general knowledge about the first aid.
First of all,you should keep calm and call the ambulance and police immediately. Secondly,you must check the wounded breathing,sometimes it is necessary to do artificial respiration. And if the wounded is bleeding,you should press the wound with a piece of clean towel or fabric. Besides,after you having done these things,all that you can do is waiting the arrival of the ambulance and police.
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