I begin by saying, " Dear Ms. Smith, " or whatever the name of the personnel officer is.

我首先说“亲爱的史密斯女士”， 或者不管人事官员的名字是什么。

… Dear Ms. Smith (or the name of their personnel officer): I am writing to inquire about any job openings you may have for someone with my experience and qualifications.

...... 亲爱的史密斯女士（或他们的人事官员的名字）：我写信是想询问您可能为具有我的经验和资格的人提供的任何职位空缺。

So, a " personnel officer" is the person who is the boss of the department that hires people, that goes out and finds people for the company and gets them to work there.

因此，“人事官”是负责招聘人员的部门的老板，负责为公司寻找人员并让他们在那里工作。