1. 最高的;最大的;最多的
    You use maximum to describe an amount which is the largest that is possible, allowed, or required.

    e.g. Under planning law the maximum height for a fence or hedge is 2 metres...
           规划法中规定，围栏或树篱最高为2米。
    e.g. China headed the table with maximum points.
           中国队以最高分位居榜首。

2. (数量)极大的,极多的
    You use maximum to indicate how great an amount is.

    e.g. ...the maximum amount of information...
           海量信息
    e.g. It was achieved with minimum fuss and maximum efficiency.
           事情事半功倍地完成了。

3. 最多;顶多;充其量
    If you say that something is a particular amount maximum, you mean that this is the greatest amount it should be or could possibly be, although a smaller amount is acceptable or very possible.

    e.g. We need an extra 6g a day maximum.
           我们一天最多还需要6克。

4. 最大限度地;尽可能充分地;竭尽全力地
    If you say that someone does something to the maximum, you are emphasizing that they do it to the greatest degree possible.

    e.g. You have to develop your capabilities to the maximum.
           你必须尽你所能。