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1·This is because fog is made of tiny water drops.

这是因为雾是由微小的水滴构成的。

2·This is because you don't know how seriously you are hurt.

这是因为你不知道自己伤得有多严重。

3·This is because the object will be about 500 kilometers above the Earth.

这是因为目标将处于地球上空约500公里处。

4·This is because in Chinese culture, long noodles are a symbol of long life.

这是因为在中国文化中，长长的面条是“长寿”的象征。

5·This is because he can make seventy-two changes to his shape and size.

这是因为他可以对自己的形状和大小做出72种改变。

6·This is because reading is an important way to get the information required to understand something.

这是因为阅读是获取理解某些东西所需信息的一条重要途径。

7·This is because their colors are not bright enough to be noticed by the human eye.

这是因为它们的颜色不够明亮，无法被人眼注意到。

8·This is because of pigments, which reflect light and make what the eye sees as colors.

这是因为色素的作用，它们反射光线，使眼睛看到的东西呈现出颜色。

9·This is because bright colors are natural colors found in many foods, and, therefore, able to raise people's spirits.

这是因为鲜艳的颜色是在许多食物中发现的天然颜色，所以能够提振人们的精神。

10·This is because of the following three reasons: Firstly, the thief only stole things from me but did not hurt me at all; secondly, the thief has stolen some of my things instead of all my things; thirdly, most luckily for me, it was the man rather than me who became a thief.

这是因为以下三个原因：第一，小偷只偷我的东西，而没有伤害我；其次，小偷偷走了我的一些东西，而不是我所有的东西；第三，对我来说最幸运的是，成为小偷的是那个人，不是我。