[ti:UNIT 4 Look into Science! Lesson 30: Keep the Candle Burning!]
[0:00.733]UNIT 4 第四单元
[0:02.636]Look into Science! 走进科学！
[0:05.638]Lesson 30: 第30课
[0:06.956]Keep the Candle Burning! 让蜡烛燃烧！
[0:09.491]THINK ABOUT IT! 想一想
[0:11.176]·Do you think science is interesting? Why or why not? ·你觉得科学有趣吗？为什么？
[0:16.409]·Name one or two famous Chinese scientists. ·说出一到两个著名的中国科学家。
[0:21.465]What do you know about them? 关于他们你了解什么？
[0:24.126]Science is so interesting! 科学是那么有趣！
[0:27.763]I'm sure you'll like this experiment! 我确定你会喜欢这个实验的！
[0:31.665]What do you need? 你需要什么？
[0:33.883]·a candle ·一支蜡烛
[0:35.302]·a candleholder ·一个烛台
[0:37.608]·a big glass jar ·一个大玻璃杯
[0:40.092]·a shallow dish with water ·一只盛水的浅盘子
[0:42.930]·matches ·火柴
[0:44.793]What do you do? 你要做什么？
[0:46.921]1.
[0:48.163]Put the candle in the candleholder. 把蜡烛放在烛台上。
[0:51.888]2.
[0:53.041]Put the candleholder in the dish. 把烛台放在盘子里。
[0:56.855]3.
[0:58.122]Fill the dish half full of water. 在盘子里放一半水。
[1:02.435]4.
[1:03.538]Light the candle. 点燃蜡烛。
[1:05.393]To make a candle burn, you "light" it. 要使蜡烛燃烧，你得点燃它。
[1:10.307]What do you use? A match. 你用了什么？一根火柴。
[1:14.118]5.
[1:15.321]Let the candle burn for two or three minutes. 让蜡烛烧两到三分钟。
[1:19.483]6.
[1:20.937]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。
[1:27.757]7.
[1:29.010]Look at the water in the jar. 看玻璃杯里的水。
[1:31.768]What observation can you make? 你可以观察到什么？
[1:35.328]What is happening? 发生了什么？
[1:37.484]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。
[1:42.800]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。
[1:49.268]The water inside the jar then rises. 然后玻璃杯里的水就上升了。
[1:53.380]How far did the water rise? 水会上升多高？
[1:56.509]There is about one-fifth oxygen in the air, 空气里大约有五分之一的氧气，
[2:01.223]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。
[2:07.636]Can you see the candleholder in this picture? 看到图片中的烛台了吗？
[2:10.857]The candle is pink. The candleholder is gray. 蜡烛是粉红的。烛台是灰色的。
[2:15.146]The candleholder is "holding" the candle! 烛台在“支撑”着蜡烛。
[2:18.678]PROJECT 任务
[2:19.939]SCIENCE? NOW THAT'S INTERESTING! 科学？现在它很有趣！
[2:22.967]Read about the experiments in this unit. 阅读本单元的实验。
[2:26.415]What experiment would you like to do for your class? 你愿意为你的同学们做什么实验？
[2:30.788]With a group of classmates, practice your experiment. 和一组同学练习你的实验。
[2:34.741]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。
[2:40.704]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：
[2:45.635]·First, describe your experiment. ·首先，描述你的实验。
[2:48.653]·Second, ask the class to guess what will happen. ·第二，让你的同学们猜会发生什么。
[2:52.728]·Third, do the experiment. Describe the experiment as you do it. ·第三，做实验。在做的时候描述它。
[2:58.770]·Finally, ask the class what happens. ·最后，问你的同学们会发生什么。
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