officer：a person in a position of command in the armed forces，a person who has a position of authority in an organization，a form of address for a member of the police force。更多地指长官，行政长官，军官等那些等级较高的官员。强调在机构中拥有权力职位的人，不仅仅指政府部门，还可以在公司，军队等。
official：a person who holds a position of responsibility，especially one who acts in a subordinate capacity for an institution such as a corporation or governmental agency。是指供职于公共职能部门的人员。更多是指普通官员，公务员等。
personnel：The body of persons employed by or active in an organization, business, or service，是员工、职员、人事的意思，跟staff一样都可翻译为职员。
memeber：someone or something that belongs to or is a part of a group or an organization
crew：A group of people working together
staff：A group of assistants to a manager, an executive, or another person in authority，直译为工作人员，制作人员，且是个统称，一般用复数形式staffs。
(staff) turnover 人员流动
employee：直译为雇员的意思，说更明确的就是合同工
inspectorate：视察人员(总称); 视察团
客户：
customer 顾客。
client
顾客;当事人;诉讼委托人;[计算机]客户端
consumer
消费者，顾客;[生态]取食者，食物链中以其他生物为食物的生物
记忆技巧：con 加强 + sum 拿，取 + er，consume 的名词 → 消费者