1. （人）公平的，明智的，理智的，有判断力的
    If you think that someone is fair and sensible you can say that they are reasonable.

    e.g. He's a reasonable sort of chap...
           他是个理智的家伙。
    e.g. Oh, come on, be reasonable.
           噢，好了，理智一点。

2. （决定或行动）公平的，合理的
    If you say that a decision or action is reasonable, you mean that it is fair and sensible.

reasonable

    e.g. ...a perfectly reasonable decision...
           完全合理的决定
    e.g. At the time, what he'd done had seemed reasonable.
           那时他的所作所为似乎很合理。

3. （期望或解释）合理的，有道理的
    If you say that an expectation or explanation is reasonable, you mean that there are good reasons why it may be correct.

reasonable

    e.g. It seems reasonable to expect rapid urban growth.
           似乎有理由期望城市快速发展。

4. （价钱）合理的，公道的，不太贵的
    If you say that the price of something is reasonable, you mean that it is fair and not too high.

reasonable的反义词

    e.g. You get an interesting meal for a reasonable price...
           你花不多的钱就可以吃一顿很特别的饭。
    e.g. His fees were quite reasonable.
           他的收费还挺合理。

5. 还算好的;不错的
    You can use reasonable to describe something that is fairly good, but not very good.

    e.g. The boy answered him in reasonable French...
           这个男孩用还算流利的法语回答他。
    e.g. He had never been able to make a reasonable living from his writing.
           他一直没能靠写作过上舒适的生活。

6. 较多的；相当大的
      A reasonable amount of something is a fairly large amount of it.

      e.g. They will need a reasonable amount of desk area and good light.
             他们将需要一个面积较大的摆放办公桌的地方和充足的照明。