Hi ,my friends, can you distinguish the real money between false money?

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my friends, Have you ever recieved an false money which will make you so upset? I hate that way so much. Can you distinguish the real money between the false money when recieve it? As far as I am concerned, I seldom recieve the false money,however, it was yesterday that I recieved a false money. I was so upset then.After that event, I think I need to learn how to distinguish the real money between the real money. What about you? Can you ?