UNIT 4 Look into Science!
第四单元 走进科学！
Lesson 31: Surprise Your Friends!
第31课： 让你的朋友们吃惊！
To:Li-Ming@net. cn From:danny@intersaurus. com
寄：Li-Ming@net. cn 来自：danny@intersaurus. com
Subject: An Experiment! Date: 24/04 5:57 PM
主题：一次实验,日期：4月24号下午5：57
Hi, Li Ming! Do you want to surprise your friends?
你好，李明！ 你想让你的朋友们吃惊吗？
Brian, Jenny and I did an experiment in science class.
布赖恩，珍妮和我在科学课上做了一个实验。
You can do it, too! First, you need to get ready.
你也可以做！首先，你需要做好准备。
Get a glass full of water and a piece of cardboard.
拿一只装满水的杯子和一张纸板。
Tell a friend to sit down.
让一位朋友坐下。
Cover the glass with the cardboard, and turn the glass over.
将杯子用纸板盖上，把杯子倒过来。
Hold it over your friend's head.
把它举在你朋友的头顶上面。
Tell your friend, "I am going to take my hand off the cardboard.
告诉你的朋友：“我将把我的手从纸板下面拿开。
Will the cardboard hold the water in the glass?"
纸板会承受住杯子里水的重量吗？”
"No, I don't think so," your friend will say.
“不，我不认为是那样，”你的朋友一定会说，
"Keep your hand on the cardboard, please!"
“请将你的手放在纸板上！”
Next, take your hand off.
接着，拿开你的手。
The cardboard will hold the water up!
纸板将承受水的重量而不使它掉下来！
Air is heavier than we think!
空气比我们想象的要强大！
It pushes down on us from above.
它从上面给我们以压力，
It also pushes up on us from below.
也从下面给我们以压力。
In the experiment, air pushes up on the cardboard.
在这个实验里，空气给纸板向上的压力。
But it can't push down on the water because the water is inside the glass.
但是它不能给水以向下的压力因为水装在杯子里。
The air holds the water! Science is interesting.
空气支撑着水！科学很有趣。
Don't you think so? Your friend, Danny
你不那么认为吗？你的朋友，丹尼
Did you try this experiment?
你试过这个实验吗？
LET'S DO IT!
做一做！
Prepare an interesting experiment you have tried before or have seen in your science books.
准备一个你试过的或是在你科学书上看过的有趣实验。
Do it and describe it to your class.
做实验并向你的同学们描述。