1. 假定;以为;假设
    If you assume that something is true, you imagine that it is true, sometimes wrongly.

    e.g. It is a misconception to assume that the two continents are similar...
           关于这两块大陆相似的假设是一种误解。
    e.g. If the package is wrapped well, we assume the contents are also wonderful...
           如果包装精美，我们就会认为里面装的也是好东西。

2. 掌管，夺取，取得（权力）；承担（责任）
    If someone assumes power or responsibility, they take power or responsibility.

    e.g. Mr Cross will assume the role of Chief Executive with a team of four directors...
           克劳斯先生将出任首席执行官，手下有4位经理。
    e.g. If there is no president, power will be assumed by the most extremist forces.
           如果没有主席，权力就会落入最极端的过激分子手中。

3. 呈现，具有，显露（某种特质）
    If something assumes a particular quality, it begins to have that quality.

    e.g. In his dreams, the mountains assumed enormous importance.
           在他的梦中，山有着至关重要的作用。

4. 表现出（某种表情）；装出，做出（某种样子）
    If you assume a particular expression or way of behaving, you start to look or behave in this way.

    e.g. He contented himself by assuming an air of superiority...
           他表现出一副高高在上的样子以获得自我满足。
    e.g. Prue assumed a placatory tone of voice.
           普吕以一种安慰人的语气说话。

5. 让我们假设；姑且假设
    You can use let us assume or let's assume when you are considering a possible situation or event, so that you can think about the consequences.

    e.g. Let us assume those clubs actually win something. Then players will receive large bonuses...
           倘若那些俱乐部真的赚了，那么球员就会获得一大笔奖金。
    e.g. Let's assume for a moment that I am a litigant in your court.
           暂且假设我是你的诉讼当事人。