join voluntarily 自愿地参加
voluntarily join
自愿加入
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Yet the most revealing news in the Cook memo is how little the union discusses assisting workers so more will voluntarily join unions.
WSJ: Review & Outlook: Michigan Union Tell-All
Most join voluntarily, many to escape a life of crushing poverty and misery.
BBC: Colombian child soldiers (archive)
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