1. 开除;将…除名
    If someone is expelled from a school or organization, they are officially told to leave because they have behaved badly.

    e.g. More than five-thousand secondary school students have been expelled for cheating.
           5,000多名中学生因为作弊被开除。
    e.g. ...a boy expelled from school for making death threats to his teacher.
           因为威胁要杀死老师而被学校开除的男孩

2. 逐出;驱逐
    If people are expelled from a place, they are made to leave it, often by force.

    e.g. An American academic was expelled from the country yesterday...
           昨天一位美国学者被逐出该国。
    e.g. They were told at first that they should simply expel the refugees.
           一开始有人告诉他们应该直接将那些难民驱逐出境。

3. 排出;喷出
    To expel something means to force it out from a container or from your body.

    e.g. Daily brushing of the skin helps the skin expel toxins...
           每天擦洗皮肤有助于皮肤排毒。
    e.g. As the lungs exhale this waste, gas is expelled into the atmosphere.
           肺呼出这些废气被排到空气中。