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While ( he is ) there he joined in voluntary labor on a project.
他在那里时参加了一项工程的义务劳动.
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Please divide each class into four groups to do voluntary labor.
请把每个班的同学统编成四个小队参加义务劳动.
Academic works at their own expense, often to the press, academic research into the voluntary labor.
学术著作常常要自费出版, 学术研究变成了义务劳动.
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