由于学校官员对这种疾病无能为力，他们正集中精力减少旷课人数。

Since school officials can't do much about the illness, they are concentrating on reducing the number of truancy.

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因此学校官员有更大的自由度。

So school officials have more freedom.

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在2006年高年级班不到60%的毕业率后，学校官员决定做出改变。

School officials decided to make changes at Ballou after less than sixty percent of the senior class graduated in two thousand six.

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