The best signal depends not only on its brightness but also on how well it contrasts with the background against which it must be seen.

最好的信号不仅取决于它的亮度，还取决于它与背景的对比度。

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They provide the background against which you can start with simplifying your life aligned with what you want.

它们所提供的背景将让你可以根据你所希翼的，从简化你的生活开始行动。

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Against the green background, the black profiles whirl obstinately like those cut-out silhouettes that are attached to a phonograph's turntable.

绿色背景上的黑色侧影固执地旋转着，就像是附在唱机唱盘上的人像侧影一样。

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The event has added symbolism this year, coming against the background of Israel's rejection of demands by the United States to stop building in disputed East Jerusalem.

VOA: standard.2010.04.01

In the first phase of the study, the researchers showed that their volunteers (Surrey university students) were slower to notice a target shade of blue when it flashed up against a blue background of a different hue than when it flashed up against a green background.

ECONOMIST: Psychology

Several senators who voted against background checks have taken hits in their approval ratings.

CNN: GOP, ready to turn your back on NRA?

"The NRA is not against background checks, " Froman said.

CNN: Gun debate: Where is the middle ground?