I usually use soft light, hard light or overlay.

我一般都选用柔光，强光或者叠加。

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But most interactions add details or change body text or overlay data on the existing pages.

但多数交互都是在已有页面上增加细节、修改主体文本或者覆盖原有数据。

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During commercials, an overlay will appear at the bottom of the screen, prompting viewers to press a button to request a free sample or order a coupon or a catalogue.

在广告期间，屏幕底部会出现一条信息，提示观众按下按钮以请求获得免费样品或订购优惠券或目录。

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Rather than fill the device with bloatware apps or overlay a custom UI, Sprint's installed a software button that takes you to a store exclusively designed for Sprint's new Android devices.

ENGADGET: Sprint guns for mid-range Android: $149 Samsung Transform, $99 Sanyo Zio, and $49 LG Optimus S include 'Sprint ID'

In the video after the break you can see the concept being illustrated with playful examples that interact with the program, but more useful applications include the ability for users to pull up subtitles for public information videos, or overlay sign language.

ENGADGET

WiMax (Worldwide Interoperability for Microwave Access) is a high capacity IP-based technology that can be deployed as a new network or as an overlay to existing 2G and 3G wireless technologies.

FORBES: Magazine Article