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街头小贩;上门推销员
You can use hawker to refer to a person who tries to sell things by calling at people's homes or standing in the street, especially when you do not approve of this activity.
例句
...as soon as she saw that it was a visitor and not a hawker or tramp at her door.
她一看到门口站着的是位访客而不是街头小贩或流浪汉…