1. 不像；与…不同
    If one thing is unlike another thing, the two things have different qualities or characteristics from each other.

    e.g. This was a foreign country, so unlike San Jose...
           这是外国，与圣何塞很不一样。
    e.g. She was unlike him in every way except for her coal black eyes.
           她除了那双乌黑的眼睛外，跟他没有一点儿相像。

2. 与…相反
    You can use unlike to contrast two people, things, or situations, and show how they are different.

    e.g. Unlike aerobics, walking entails no expensive fees for classes or clubs.
           散步不像有氧健身操那样需要交纳昂贵的费用来参加健身班或俱乐部。

3. 与…平时不同；不像…平常那样
    If you describe something that a particular person has done as being unlike them, you mean that you are surprised by it because it is not typical of their character or normal behaviour.

    e.g. It was so unlike him to say something like that, with such intensity, that I was astonished...
           他一反常态用如此强烈的语气说出那番话，着实让我吃惊。
    e.g. 'We'll all be arrested!' Thomas yelled, which was most unlike him.
           “我们都会被抓的！” 托马斯大声嚷道，跟平时的他判若两人。