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1·Why does the sky look blue?

为什么天空看起来是蓝色的？

2·In fact, the sky has no color. Then why does the sky look blue?

事实上，天空没有颜色。那为什么天空看起来是蓝色的呢？

3·You look blue this morning.

你今天早晨看上去很忧伤。

4·What's wrong? You look blue today.

怎么啦？你今天闷闷不乐的。

5·They look blue to me.

看起来是蓝色的。

6·Mary: Jack, you look blue. What's wrong?

玛丽：杰克，你看起来闷闷不乐的，怎么了?。

7·What's the matter, Elizabeth? You look blue this.

伊丽莎白，出什么事了？你今天早晨看上去很忧伤。

8·Some look white, some look red and some look blue.

一些看起来白色，一些看起来红色，一些看起来蓝色。

9·Rob, you don't look blue to me - just your normal colour.

罗布，我觉得你的脸看起来不青啊——只是正常的颜色而已。

10·In infrared light, shorter wavelengths look blue, and longer wavelengths appear red.

红外光下，较短的波长会程现蓝色，而较长的波长则程现红色。