appoint v. /assign v.

appoint的意思是“任命，指派，委任”，后多跟职位一类的名词;

assign的相关意思是“分配，分派，指定”，后多跟具体的工作。

例：They appointed him Minister of Education.

他们任命他为教育部长。

She was appointed to the Chairmanship of the Committee.

她被任命为委员会的主席。

The problem was assigned to a commission.

这项任务交给了一个特别委员会去处理。

I assign you to wash the dishes.

我分配你去洗盘子。