1. 优先事项；最重要的事；当务之急
    If something is a priority, it is the most important thing you have to do or deal with, or must be done or dealt with before everything else you have to do.

    e.g. Being a parent is her first priority...
           做好母亲是她的头等大事。
    e.g. The government's priority is to build more power plants...
           政府的首要任务是建造更多的发电站。

2. 优先考虑；给…优先权
    If you give priority to something or someone, you treat them as more important than anything or anyone else.

    e.g. The school will give priority to science, maths and modern languages...
           学校将重点发展理科、数学和现代语言。
    e.g. The proposals deserve support as they give priority to the needs of children.
           这些提议值得拥护，因为它们优先考虑了儿童的需求。

3. 优先于；比…重要
    If something takes priority or has priority over other things, it is regarded as being more important than them and is dealt with first.

    e.g. The fight against inflation took priority over measures to combat the deepening recession...
           抵制通货膨胀比抑制日益加剧的经济衰退更为重要。
    e.g. I disagree with the premise that economic development has priority over the environment.
           我不赞成经济发展应优先于环境保护这个前提。