1. 想象;设想
    If you imagine something, you think about it and your mind forms a picture or idea of it.

    e.g. He could not imagine a more peaceful scene...
           他想象不出比这更祥和的景象。
    e.g. She couldn't imagine living in a place like that...
           她无法想象住在那样一个地方。

2. 猜测;猜想;认为
    If you imagine that something is the case, you think that it is the case.

    e.g. I imagine you're referring to Jean-Paul Sartre...
           我猜你说的是让－保罗·萨特。
    e.g. We tend to imagine that the Victorians were very prim and proper...
           我们往往认为维多利亚时代的人们都一本正经,谨言慎行。

3. 臆想;幻想
    If you imagine something, you think that you have seen, heard, or experienced that thing, although actually you have not.

    e.g. I realised that I must have imagined the whole thing.
           我意识到大概整件事都是我臆想出来的。