Is two faces against a white background?

经典的“脸还是花瓶？”错觉就是一个例子。这是两张脸相对于白色背景？

For Word processing, that meant dark text on white background.

所以文字处理也要呈现出白纸黑字。

Maybe spiders against the white background are just harder to spot.

也许只是蛛蛛们在白色布景下更不容易被发现。

Finally the screen was finished - simple white background with black text, academic-looking.

最后，整个屏幕都清空了——简洁的白色背景和黑色标题，看上去很有学术氛围。

The red X on a white background is known as St. Patrick's Saltire.

这面白底红交叉的旗帜以圣帕特里克十字旗著称。

It also means to be easy to see. The purple letters show up well on the white background.

它也表示能够轻易看见。紫色的字在白纸上显得很清晰。

So for example, we have a white background where there is no object.

例如，我们有一个没有物体的白色背景。

The Hell's Angels patches usually have red letters on a white background.

地狱天使的补丁通常是白底红字。

The flag of England is a white background with a red cross on it.

英格兰国旗为白底，上面有一个红十字。

20. The six colors – blue, yellow, black, green, red, and the white background – were chosen because every nation's flag contains at least one of them.

20. 选择六种颜色——蓝色、黄色、黑色、绿色、红色和白色背景——是因为每个国家的国旗至少包含其中一种颜色。

These pictures are all shot in a very clean manner on black and white backgrounds using studio lighting so we can see the essence in the animal in true color.

这些图片都是在黑白背景上用影棚灯光拍摄的，非常干净利落，所以我们可以在真实的颜色下看到动物的本质。

Each animal on a black and white background to eliminate distractions and allow you to look them in the eye and see that there's great beauty there and intelligence and they're worth saving.

每只动物都有黑白背景，以消除干扰，让你看着它们的眼睛，看到它们的美丽和智慧，它们是值得拯救的。

Blue won out: Not only was it dark enough to show up on a white background and light enough to show up on a black background, but it also " didn't interfere with retention."

它不仅足够低调，可以显示在白色背景上但不抢眼；也足够亮，可以显示在黑色背景上能被看到，而且“不干扰用户阅读”。