UNIT 4 Look into Science!
第四单元 走进科学！
Lesson 30: Keep the Candle Burning!
第30课 让蜡烛燃烧！
THINK ABOUT IT!
想一想
Do you think science is interesting? Why or why not?
你觉得科学有趣吗？为什么？
Name one or two famous Chinese scientists.
说出一到两个著名的中国科学家。
What do you know about them?
关于他们你了解什么？
Science is so interesting!
科学是那么有趣！
I'm sure you'll like this experiment!
我确定你会喜欢这个实验的！
What do you need?
你需要什么？
a candle ,a candleholder ,a big glass jar ,
一支蜡烛,一个烛台,一个大玻璃杯,
a shallow dish with water ,matches
一只盛水的浅盘子,火柴
What do you do?
你要做什么？
1.Put the candle in the candleholder.
把蜡烛放在烛台上。
2.Put the candleholder in the dish.
把烛台放在盘子里。
3.Fill the dish half full of water.
在盘子里放一半水。
4.Light the candle.
点燃蜡烛。
To make a candle burn, you "light" it.
要使蜡烛燃烧，你得点燃它。
What do you use? A match.
你用了什么？一根火柴。
5.Let the candle burn for two or three minutes.
让蜡烛烧两到三分钟。
6.Carefully put the jar over the candle until the top of the jar rests on the dish.
轻轻地将玻璃杯罩在蜡烛上，直到玻璃杯的顶部碰到盘子。
7.Look at the water in the jar.
看玻璃杯里的水。
What observation can you make?
你可以观察到什么？
What is happening?
发生了什么？
As the candle burns, it uses up oxygen in the air.
蜡烛燃烧的时候，它消耗了空气里所有的氧气。
When the candle stops burning, it has used up all the oxygen in the air.
当蜡烛停止燃烧时，它烧完了空气中所有的氧气。
The water inside the jar then rises.
然后玻璃杯里的水就上升了。
How far did the water rise?
水会上升多高？
There is about one-fifth oxygen in the air,
空气里大约有五分之一的氧气，
so the water rises and fills about one-fifth of the jar.
所以水面上升，充满大约五分之一的杯子。
Can you see the candleholder in this picture?
看到图片中的烛台了吗？
The candle is pink. The candleholder is gray.
蜡烛是粉红的。烛台是灰色的。
The candleholder is "holding" the candle!
烛台在“支撑”着蜡烛。
PROJECT .SCIENCE? NOW THAT'S INTERESTING!
任务. 科学？现在它很有趣！
Read about the experiments in this unit.
阅读本单元的实验。
What experiment would you like to do for your class?
你愿意为你的同学们做什么实验？
With a group of classmates, practice your experiment.
和一组同学练习你的实验。
Do it again and again. As you do it, describe it in English!
一次次地做实验。在做实验的时候，用英语描述。
Then, do your experiment for the class. Don't forget to:
然后，为你的同学们做实验。不要忘了：
First, describe your experiment.
首先，描述你的实验。
Second, ask the class to guess what will happen.
第二，让你的同学们猜会发生什么。
Third, do the experiment. Describe the experiment as you do it.
第三，做实验。在做的时候描述它。
Finally, ask the class what happens.
最后，问你的同学们会发生什么。