任用的英文：
to appoint
to assign

参考例句：

The captain decided to play him as goalkeeper.
队长决定任用他担任守门员。

Why is the function of staffing so seldom approached logically?
为什么任用功能如此难于作到合理？

Within the staffing area itself, appraisal, inventorying, selection, and development are closely related
在任用的范围内，评价、储备、选择以及培养等过程都息息相关。

With adequate safeguards, i.e., reputation, cronyism may be avoided.
因为适当的防护，如声誉、任用亲信可能被避免。

appoint是什么意思：
v. 任命，指派，委派

to cancel an appointment
取消约会

Appointments can be made by arrangement.
约见时间可以商定解决。

He will only see you by appointment.
只有事先约好他才能接见你。

It was a luxuriously appointed room.
这是一个陈设豪华的房间。

She is appointed director of the farm.
她被委任为农场指导。

assign是什么意思：
v. 分配；指派；指定；把…归于；确定；转让
n. 受让人，受托者

assignable adj.
可分配的；可直定的；可归属的

give an assignment to (a person) to a post, or assign a task to (a person).
派某人到某个职位或分派任务给某人。

make the assignment for the next day
布置第二天的作业

fall to somebody by assignment or lot.
通过分配或者划分使某人垮台。

They tapped her for a reportorial assignment.
他们指定她去完成一次报道任务。