天气变化的原因

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What are the causes of these changes in the weather?

这些天气变化的原因是什么？

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Here is a line

这是一条线。

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Here is a change in the direction of the line

这是线方向上的一个变化。

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This bird was wet

这只鸟曾经是湿的。

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It was in the rain

它当时在雨里。

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Now it is dry

现在它干了。

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That is a change

那就是一个变化。

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It was wet

它曾经是湿的。

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It is dry

它现在是干的。

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What is the cause of these changes in the weather?

这些天气变化的原因是什么？

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Why are there these changes of weather?

为什么会有这些天气变化？

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There is not one cause only

原因不止一个。

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There are numbers of causes

有很多个原因。

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Changes in the heat which comes to us from the sun are one cause of changes of weather

从太阳来到我们这里的热量的变化，是天气变化的原因之一。

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The amount of heat which the earth gets from the sun is different from time to time

地球从太阳得到的热量，时时不同。

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There are changes in the sun

太阳本身也在变化。

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If you take a look at the sun through a bit of dark glass you may see small marks on the face of the sun

如果你透过一片深色玻璃看太阳，你也许能看到太阳表面上的小斑点。

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One dollar is a small amount of money

一美元是一小笔钱。

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A million dollars is a great amount of money

一百万美元是一大笔钱。

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A drop of rain is a very small amount of water

一滴雨是非常少量的水。

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There is a small amount of water in this glass

这个杯子里有少量的水。

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There is a great amount of water in the sea

海里有大量的水。

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This is the sea

这就是大海。

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Those are ships which are on the sea

那些是海上的船。

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Changes in the heat which comes to the earth from the sun are one cause of changes in the weather

从太阳来到地球的热量的变化，是天气变化的原因之一。

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This discovery is new

这个发现是新的。

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A man of science made the discovery in 1944

一位科学家在一九四四年做出了这个发现。

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He made it by measuring the heat which comes to the earth every day from the sun

他是靠测量每天从太阳来到地球的热量做到的。

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The amount of heat is different from day to day

热量的多少每天都不同。

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On some days the sun sends more heat to the earth

有些日子，太阳送给地球更多的热量。

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On other days it sends less heat to the earth

另一些日子，它送给地球较少的热量。

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There is more water in this glass than in that

这个杯子里的水比那个杯子里的多。

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Men are making new discoveries every day

人们每天都在做出新的发现。

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Columbus made the discovery of America in 1492

哥伦布在一四九二年发现了美洲。

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Columbus came to America in his ship in 1492

哥伦布在一四九二年乘船来到美洲。

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What were some other great discoveries?

还有哪些别的伟大发现？

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One of them was fire

其中之一是火。

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Fire is of very great use to men

火对人非常有用。

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It gives us heat

它给我们热。

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Another great discovery was the wheel

另一个伟大发现是轮子。

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Wheels are round

轮子是圆的。

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They go round

它们转动。

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This is a cart

这是一辆车。

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They are of very great use to man

它们对人非常有用。

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Another great discovery was clothing

另一个伟大发现是衣服。

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What are these?

这些是什么？

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These are some other sorts of clothing

这些是别的几种衣服。

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This is a skirt

这是一条裙子。

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This is a shirt

这是一件衬衫。

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The making of cloth was a great discovery

织布是一个伟大的发现。

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This is how we make cloth

我们就是这样织布的。

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These are threads

这些是线。

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They go across from one side to the other of a frame

它们从框架的一边横穿到另一边。