predecessor

先行者；在任何状态、职位、职务等方面先于他人的人；在职务或职位上为后者所接替的人。

One who precedes; one who has preceded another in any state, position, office, etc.; one whom another follows or comes after, in any office or position.

在时间上先于你的人(如担任职务或职位)

one who precedes you in time (as in holding a position or office)

先于当前(或后来)型号的机械或设备模型或类型；通常指较早的过时型号。

A model or type of machinery or device which precedes the current (or later) one. Usually used to describe an earlier, outdated model.

先于某物或某人出现并预示其到来的事物

something that precedes and indicates the approach of something or someone

存在有向路径通往另一顶点的顶点。

A vertex having a directed path to another vertex