发病率出现

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1.

The researchers also found an increased incidence of asthma among individuals who did not have the condition prior to the attack .

研究人员也发现在袭击前没有哮喘的个体，哮喘发病率出现增加。

3.

Cancer rates have dropped off, and some brush has returned to once-barren hills .

癌症发病率出现了下降，一度贫瘠的山上重新长出了一些植被。

4.

The incidence declined in 2 . 7% of the 185 districts studied , was unchanged in 86. 2% and increased in 9. 6%.

被研究的 185 个地区中，2.7%的登革热发病率出现了下降，86.2%不变，9.6%上升。