An overlay showing population can be placed on top of the map.

可以在地图上加一层显示人口的透明膜。

《牛津词典》

For example, we want to build a key at the top of the map image with image identifiers and text.

例如，我们需要在地图图像的顶部构建一条带图像标识符和文本的路线。

youdao

They can return to the top level of the map by clicking the beginning of the breadcrumb trail at the top of the page.

他们可以通过单击页面顶部的导航路径记录(breadcrumb trail)来返回这个图的最顶层。

youdao

The team was to create the first map of the area and find a possible path to the top of the great mountain.

VOA: special.2010.06.30

It has hired a team from the Marshall School of Business to trawl through it and to map the competences of the top executives in various functions and industries.

ECONOMIST: Management appraisal

Women aren't as worried about the pay gap as they were five years ago, says Carol Gallagher , president of the Executive Women's Alliance and author of Going To The Top: A Road Map for Success from America's Leading Women Executives.

FORBES: Are Women Happy Under The Glass Ceiling?

Perhaps the coolest feature is the link map, triggered from an icon at the top of each article page.

WSJ: Encyclopaedia Britannica Now Fits Into an App