UNIT 5 Lessons 25-30 Look into Science

第五单元 第25-30课 科学探究

Lesson 25: Let's Do an Experiment!

第25课 我们做个实验吧！

Danny, Jenny and Brian are in the lab.

丹尼，珍妮和布莱恩在实验室。

Let's do an experiment. I fill a jar with water.

我们做个实验吧。瓶子里装满水，

I cover the top with a piece of cardboard and hold it there.

用一块硬纸板盖住瓶口，并压住纸板。

Then I turn the jar upside down and take my hand off the cardboard.

接下来，将瓶子倒过来，把手从纸板上拿开。

Can you guess what will happen?

你能猜到，将会发生什么吗？

I think the floor will get wet. We should do this experiment outside, Brian.

我想地面会被弄湿。我们应该到室外做这个实验，布莱恩。

I think the cardboard will hold the water.

我认为纸板会托住瓶子里的水。

I don't think so.

我不这么看。

You think the water will pour out, Danny. I think the water will stay in the jar.

丹尼，你觉得谁会涌出来。我认为水会留在瓶子里。

Let's test which theory is correct.

我们来测试下哪种推测是正确的吧。

Good idea, Jenny. That's called the scientific method.

好主意，珍妮。这被称作为科学方法。

I am so sure of my theory that Brian can do the experiment over your head and I know you won't get wet.

我非常肯定我的推测，因此，布莱恩可以在你头上来做这个实验；并且，我认为不会淋湿你。

Well, let's try it!

嗯，那我们试一试！

Are you ready, Danny?

你准备好了吗，丹尼？

No! Wait! (He puts on a raincoat and sits down.) Now I think I'm ready.

不！等一等！(他穿上雨衣，坐了下来。)我想，现在我准备好了。

Brian, take your hand off the cardboard.

布莱恩，把你的手从纸板上拿走。

No!

不！

(Danny closes his eyes tightly, and Brian takes his hand off the cardboard.

丹尼紧紧地闭上眼睛，布莱恩把手从纸板上拿开了。

The water stays in the jar.)

水仍然留在了瓶子里。

See, Danny!

看，丹尼！

How is that possible?

怎么可能？

The force of the air keeps the water in the jar.

空气的压力让水留在瓶子里。

It is strong enough to hold the water.

空气的压力足够大，能托起（瓶中的）水。

Wow!

哇哦！

So what have we discovered?

那么，我们发现了什么？

We have discovered that the air pressure helps the cardboard hold the water in the jar.

我们发现，大气压能帮助纸板让水留在瓶子里。

Right. What do you conclude, Danny?

对的。丹尼，你得出什么结论？

I conclude that air is stronger than I thought.

我总结出大气比我想象的要强大。