第十五课

Unit 5  technology products

第五单元 科技产品

Ballpoint pen, a variety of convenient to use clever production.

圆珠笔，种类多,方便使用巧制作。

Magnetic levitation, there are secrets, technology products are really amazing.

磁悬浮，有秘密,科技产品真神奇。

Lesson 15 The secret of the ballpoint pen

第十五课 圆珠笔的秘密

1 Questions and guesses

问题与猜测

2 Try it and write with a ballpoint pen.

试一试，用圆珠笔写字，有什么发现？

3 Guess what's in the ballpoint pen.

猜一猜，圆珠笔的里面有什么。

4 There is a button on this ballpoint pen.

这支圆珠笔上有个按钮。

5 Explore and practice

探究与实践

6 Take it apart and see what the components of the ballpoint pen are.

拆一拆，观察圆珠笔有哪些组成部分。

7 Pen barrel, refill, spring

笔杆、 笔芯、 弹簧

8 Study the function of the various parts of the ballpoint pen.

研究圆珠笔各部分的功能。

9 It is not convenient to write with only the core

只用笔芯写字不方便。

10 Without this ...

如果没有这个……

11 How did the oil in the core come out?

笔芯里分油是怎么出来的呢？

12 it the same as this ball device?

和这种滚珠装置一样吗？

13 Expand and innovate

拓展与创新

14 Ballpoint core can't write, what's the reason?

圆珠笔芯写不出字，是什么原因？

15 What else can the ball unit do?

滚珠装置还可以用来做什么？