四月份的时候，我们班参加了重庆市璧山县璧城镇实验小学璧南河污染情况的查小组，去调查璧南河的污染情况。 。
In April, our class took part in the chongqing bishan BiCheng Town experiment elementary school wall south river pollution situation of check group, to investigate the wall of south river pollution.
四月份的时候，我们班参加了重庆市璧山县璧城镇实验小学璧南河污染情况的查小组，去调查璧南河的污染情况。 。
In April, our class took part in the chongqing bishan BiCheng Town experiment elementary school wall south river pollution situation of check group, to investigate the wall of south river pollution.
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