Even though we hear less problems in the news, but it may happen to you. So we must always be alert and careful. I've suggested ways to prevent it from happening. Firstly, we must dry our hands before switch on or off the plug. Secondly, we must not poke things such as pens into the socket hole. Thirdly, we must not put too many plugs into one socket. Thats all for my suggestion!
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