Sources: American Federation of teachers; interviews with elementary and middle school teachers in California, Connecticut, Georgia, Iowa, Minnesota, New York, and Texas.
资料来源：美国教师联合会，采访了来自加利福尼亚、康乃狄格、乔治亚、衣阿华、明尼苏达、纽约和德克萨斯州的中小学教师。
Sources: American Federation of teachers; interviews with elementary and middle school teachers in California, Connecticut, Georgia, Iowa, Minnesota, New York, and Texas.
资料来源：美国教师联合会，采访了来自加利福尼亚、康乃狄格、乔治亚、衣阿华、明尼苏达、纽约和德克萨斯州的中小学教师。
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