五一劳动节当天，洛杉矶爆发近年来最大规模的移民大游行，抗议亚利桑那州新近通过美国最严厉的反非法移民法案，抗议者同时指责奥巴马总统没有兑现竞选承诺，至今没有推动移民改革。据主办方估计，当天至少有5万人参加了游行。中新社发 张炜 摄
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