调查人员在印度对200所学校进行随机访问时发现，有半数的学校在访问时没有教学活动。
In random visits to 200 primary schools in India, investigators found no teaching activity in half of them at the time of visit.
调查人员在印度对200所学校进行随机访问时发现，有半数的学校在访问时没有教学活动。
In random visits to 200 primary schools in India, investigators found no teaching activity in half of them at the time of visit.
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