外企中职位从低到高排序为：senior < staff < principal。具体来说： senior：通常指的是高级工程师，是底层职位中的一大分支，虽然听起来威风，但在整个职位体系中仍处于. For staff in the sense of a body of employees, the plural is always staffs; Otherwise, both staffs and staves are acceptable, except in compounds;
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例子： we have a full time nurse on staff. Working as a member of the group of people employed by an organization or business. A staff member (of…)；one of the staff members (of…)， a member of staff (of…), one of the members of the staff (of…)， on the staff (of…)。 《牛津高阶英汉双解词典》 第六.
