assign [əˈsaɪn]

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vt.派，指派；分配，分派；指定或选定

to give a particular job or piece of work to someone

It is possible to assign an exact date to this building. 这座建筑物的确切年代是可以确定的。
It's difficult to assign any reason for the failure. 失败的原因很难确定。