More than 2,000 middle and high school teachers took an online survey. Researchers also spoke with teachers in focus groups.
2000多所中学和高中的教师参加了网络调查，研究者还与重点小组的教师们谈了话。
More than 2,000 middle and high school teachers took an online survey. Researchers also spoke with teachers in focus groups.
2000多所中学和高中的教师参加了网络调查，研究者还与重点小组的教师们谈了话。
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