UNIT 4 Look into Science! Lesson 25: Let's Do an Experiment!

[ti:UNIT 4 Look into Science! Lesson 25: Let's Do an Experiment!]
[0:00.466]UNIT 4 第四单元
[0:02.644]Lessons 25～32 第25~32课
[0:05.438]Look into Science! 观察科学！
[0:07.483]You Will Learn 你将学到
[0:08.630]Functions 实际应用
[0:09.678]·Certainty and Uncertainty¹ 确定及不确定
[0:12.221]·Sequence 顺序
[0:13.468]Grammar 语法
[0:14.566]·The Simple Future Tense 一般将来时
[0:16.810]Structures 固定结构
[0:18.207]·fill/cover... with 用……把……装满/盖住
[0:20.502]·right side up 正面朝上
[0:22.198]·take away 取走
[0:23.594]·turn... upside² down 把……翻转
[0:25.739]·use up 用完
[0:27.136]Lesson 25: 第二十五课：
[0:29.031]Let's Do an Experiment! 让我们做一个实验吧！
[0:31.194]THINK ABOUT IT! 想一想
[0:32.797]·Do you like to do experiments? ·你喜欢做实验吗？
[0:36.337]What experiments have you done? 你作过什么样的实验？
[0:39.209]·What experiment is Brian going to do? ·布赖恩要做的是什么实验？
[0:42.816]·What's Danny's theory about what will happen? ·对于将要发生的事，丹尼的理论是什么？
[0:46.423]One Experiment, Two Theories 一个试验，两个理论
[0:51.099]A "theory" is an idea. 一个“理论”是一个观点。
[0:53.504]A theory predicts³ what will happen. 理论预见将会发生什么。
[0:56.643]An experiment shows what happens. 试验展示发生了什么。
[1:00.317]Did you read about this experiment, Danny? 丹尼，你读过关于这个实验的事吗？
[1:03.389]I fill a jar with water. 我在广口瓶中加了水。
[1:05.460]I cover the top with a piece of cardboard⁴. 我用一片纸板盖住了顶部。
[1:08.933]Then, I turn the jar upside down. 之后，我把广口瓶倒置。
[1:12.674]Guess what will happen! 猜一猜会发生什么事！
[1:15.145]I'm not sure. 我不确定。
[1:16.481]I think the floor will get wet. 我想地板会湿的。
[1:19.020]Maybe you should do this experiment outside, Brian! 或许你应该在户外做这个实验，布赖恩！
[1:23.027]No, we can do it inside. 不，我们可以在里面做。
[1:25.899]I'm sure the floor won't get wet. 我确信地板不会湿的。
[1:29.172]Why not? 为什么不会湿呢？
[1:30.575]The cardboard can't keep the water in the jar! 纸板挡不住广口瓶中的水！
[1:34.430]Let's do the experiment and see what happens. 让我们做这个实验看看会发生什么事。
[1:38.972]Brian has one theory, and Danny has another. 布赖恩有一个理论，而丹尼有另一个。
[1:43.915]We can prove who's right. 我们可以证明谁说得对。
[1:46.921]Great! 太棒了！
[1:47.856]We'll do the experiment and observe what will happen. 我们将做这个实验，并观察会发生什么事。
[1:51.797]That's called the scientific method. 这被称为科学方法。
[1:55.195]Learning Tips 学习贴士
[1:57.413]Observe is another way of saying watch carefully. “Observe”与“watch carefully”表达的意义相同。
[2:02.335]LET'S DO IT! 做一做!
[2:04.012]If Brian does the experiment, will the floor get wet? 如果布赖恩做实验，地板会湿么？
[2:08.773]Imagine what will happen. With a partner, make up a dialogue. 想象一下会发生什么？和一个伙伴做对话。
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1 uncertainty   

n.易变，靠不住，不确知，不确定的事物

参考例句：

• Her comments will add to the uncertainty of the situation.她的批评将会使局势更加不稳定。
• After six weeks of uncertainty,the strain was beginning to take its toll.6个星期的忐忑不安后，压力开始产生影响了。

2 upside   

n.上侧，上段，上部

参考例句：

• The children hung the picture upside down.小孩把画挂倒了。
• If you turn the envelope upside down, the key will fall out.你如果把信封倒过来，钥匙就会掉出。

3 predicts   

预言，预测，预示( predict的第三人称单数 )

参考例句：

• The weather bureau predicts that there will be an earthquake. 气象局预测将有地震。
• Theory thus predicts that there will be a flare of infrared radiation. 因此，理论预言会有红外辐射耀发。

4 cardboard   

n.硬纸板，卡纸板

参考例句：

• She brought the shopping home in a cardboard box.她将买的东西放在纸箱里带回家。
• There is a sheet of stiff cardboard in the drawer.在那个抽屉里有块硬纸板。