1. 使突出;强调;使注意
    If someone or something highlights a point or problem, they emphasize it or make you think about it.

highlight

    e.g. Last year Collins wrote a moving ballad which highlighted the plight of the homeless...
           去年，柯林斯写了一首动人的抒情歌曲，突出描绘了无家可归者的苦境。
    e.g. Once again, the 'Free Press' prefers not to highlight these facts...
           “自由新闻”组织再次故意不去突出强调这些事实。

2. （用荧光笔）标出;（在计算机屏幕上）突出显示
    To highlight a piece of text means to mark it in a different colour, either with a special type of pen or on a computer screen.

highlight的解释

    e.g. Highlight the chosen area by clicking and holding down the left mouse button.
           点击并摁住鼠标左键将所选区域高亮显示。
    e.g. ...the relevant maps with the route highlighted in yellow.
           用黄色荧光笔标出路线的相关地图

3. 最有趣（或最精彩、最重要）的部分
    The highlights of an event, activity, or period of time are the most interesting or exciting parts of it.

    e.g. ...a match that is likely to prove one of the highlights of the tournament...
           可能是本次联赛中最精彩的比赛之一
    e.g. The highlight of my day used to be cooking Meg a meal when she came in from work...
           过去，我一天中最有意思的事就是在梅格下班回到家时为她做顿饭。

4. 挑染的头发;（头发经阳光照射后产生强光效果的）浅色部分
    Highlights in a person's hair are narrow lighter areas made by dyeing or sunlight.