1. 部分;片段
    A segment of something is one part of it, considered separately from the rest.

    e.g. ...the poorer segments of society.
           社会中的较贫穷阶层
    e.g. ...the third segment of his journey.
           他此行的第三程

2. (橘子、葡萄柚等水果的)瓣
    A segment of fruit such as an orange or grapefruit is one of the sections into which it is easily divided.

3. 圆缺;弓形
    A segment of a circle is one of the two parts into which it is divided when you draw a straight line through it.

4. (市场)细分的部分
    A segment of a market is one part of it, considered separately from the rest.

    e.g. Three-to-five day cruises are the fastest-growing segment of the market...
           3 至 5 天的乘船游览是该市场中发展最快的部分。
    e.g. Women's tennis is the market leader in a growing market segment — women's sports.
           女子网球正引领着一个逐渐壮大的市场——女子运动市场。

5. 细分，划分(市场)
    If a company segments a market, it divides it into separate parts, usually in order to improve marketing opportunities.

    e.g. The big six record companies are multinational, and thus can segment the world market into national ones.
           六大唱片公司都是跨国经营，因此能够将世界市场按国家划分。