Do you know the mean?

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English is the second language in our country and everyone must study it in school. One day,our english teacher told us a joke.one of her students gave her an email in which there was a sentence--i am a river lake small hun hun.Saw the sentence,my teacher was very puzzled,she did not know what does it mean,After she think it for a while.She could not laughing.What about you,do you know what does it mean?If you are chinese,you may konw,but if you are not,i am afraid you may not konw the meaning forever.