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2.可适当增加细节，以使行文连贯。
Volunteers Wanted
The Winter Holiday is drawing near. To encourage the citizens to have a green and healthy Spring Festival, the Student Union will organize a \"Green Spring Festival\" activity. Anyone who wants to have a meaningful and colorful holiday and is ready to offer a helpful hand to others is welcome. Your participation will surely make a difference.
This voluntary activity will take place in the downtown and last a week. If you are interested , please sign up at the Student Union office from January 13th to January 20th.
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