personnel是单数还是复数

是单数，意思是人事部门，例如：

1、There has been very little renewal of personnel in higher education从事高等教育的人员新老更替极其缓慢。

2、They lacked the scientific personnel to develop the technical apparatus much further.他们缺少能够进一步研发这一技术装置的科研人员。

3、Address your application to the Personnel Manager.把你的申请信寄给人事经理。