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流动小贩；货郎
A peddler is someone who goes from place to place in order to sell something.
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毒贩
A drug peddler is a person who sells illegal drugs.
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（思想或信息的）宣扬者，散布者
A peddler of information or ideas is someone who frequently expresses such ideas to other people.
例句
...the peddlers of fear.
恐惧的散布者