人次 is a special classifier which indicates statistics that refer to the number of people.
For example, it can be used to talk about the number of cases of a disease or visits to some place.
That’s why, depending on the context, it is translated differently.
Examples
会期参观人数达1000人次
The total number of visitors to the meeting was one thousand
huìqí cānguān rénshù dá yí qiān réncì
我们接到300多人次询问这个工作的情况
We’ve received more than three hundred applications for this position
wǒmen jiēdào sānbǎi duō réncì xúnwèn zhè ge gōngzuò de qíngkuàng
哮喘发作入院人次已成倍增加
The number of hospitalized patients because of asthma has doubled
xiāochuǎn fāzuò rùyuàn réncì yǐ chéng bèi zēngjiā
这个图书馆每年吸引游客一百万人次
This library attracts one million visitors annually