If phones really do cause cancer, but only at high exposure, employing such a generous definition of regular use means that the effect might be diluted into undetectability.

• 如果手机真的引发癌症，但只有在高频率使用才能致病。应用这样一个定义作为常规使用意味着这种影响被冲淡到无可检测的地步。