I see. By the way, how many people are working in your factory now?
哦,我知道了。顺便问一下,现在贵厂有多少在职职工?
if there is any effect of noise upon mental health it must be so small that present methods of psychiatric diagnosis cannot find it.
如果噪音对精神健康有影响的话,那也一定是微乎其微,以致现代的精神病诊断方法还发现不了。