英语翻译一句话 计算机有关 中译英这个参数是否是唯一的,可否用作是用户的唯一标识

Is this parameter unique？
Does it allow the users' unique identify？
例如
数字证书可用于唯一标识某个实体。
Digital certificates allow unique identification of an entity.

Is this parameter one and only? could it be taken as the int ID of the user?

Is this argument unique?Can be used as the user's unique identifier?
答案纯手打,手指动一下,

Whether this parameter is unique, can be used as the unique identifier of the user