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。
The researchers also found an increased incidence of asthma among individuals who did not have the condition prior to the attack.
不过，研究人员也发现，网页的下载速度在两种网络条件下基本相同。
However, the researchers found that web page download times are virtually the same using wi-fi or wired connections.
这些美国研究人员也发现，轮班工作者的褪黑激素量较低。
The US researchers also found lower melatonin levels in shift workers.
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