1. 恳求；请求
    If you plead with someone to do something, you ask them in an intense, emotional way to do it.

    e.g. The lady pleaded with her daughter to come back home...
           这位女士恳求她的女儿回家。
    e.g. He was kneeling on the floor pleading for mercy...
           他跪在地板上请求宽恕。

2. 作（有罪或无罪的）答辩
    When someone charged with a crime pleads guilty or not guilty in a court of law, they officially state that they are guilty or not guilty of the crime.

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    e.g. Morris had pleaded guilty to robbery.
           莫里斯已承认犯有抢劫罪。

3. 为…辩护；维护；声援
    If you plead the case or cause of someone or something, you speak out in their support or defence.

    e.g. He appeared before the Committee to plead his case...
           他出现在委员会面前为自己辩护。
    e.g. He would plead the cause of Russian unity.
           他会公开支持俄罗斯的统一。

4. 提出…为理由；把…作为借口
    If you plead a particular thing as the reason for doing or not doing something, you give it as your excuse.

    e.g. Mr Burke, pleading poverty, changed his mind...
           伯克先生以自己穷为由改变了主意。
    e.g. Mr Giles pleads ignorance as his excuse...
           贾尔斯先生把不知情当作自己的借口。