eg.the same ip click my ad 3 times,that means the clicks is 3 and visitor is 1,right? and does google analysis track the keyoword that visitors use in orginac search.
was this figured out through analytics? It is possible that a visitor clicks to your site several times, but it does not mean that you were charged for each click.
I think he means clicks he paid for is 418 and visitors were only 217, another post said that don't expect Analytics to be accurate all the time.