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The Merchant of Venice is one of William Shakespeare's best-known plays, written at an uncertain date between 1594 and 1597. It is a comedy ("comedy" had a very different meaning at the time; see Shakespearean comedies) and is best known for its portrayal of the Jew Shylock, which has raised questions of anti-semitism. Shylock is a tormented character but is also a tormenter, so whether he is to be viewed with disdain or sympathy is up to the reader.
more detail:
http://en.wikipedia.org/wiki/The_Merchant_of_Veni ce
Someone else has answered this question in Chinese here: (but it's about the movie)
http://hk.knowledge.yahoo.com/question/?qid=7006091502973