How Does it Work?

How does it work?

它是怎么运作的？

How does a magnetic building kit work? You can use a magnetic building kit to make all sorts of shapes. There are some small magnetic rods and ball bearings in the kit.

磁力拼装套装是怎么运作的呢？你可以用磁力拼装套装来 拼出各种各样的形状。套装里有细小的磁力棒和滚珠，放在 套装里。

All magnets have a south pole and a north pole. When you put the north end of a magnet near the south end of another magnet, they join together. This is because the opposite ends of magnets attract each other. You put the ball bearings between the rods so that you can make interesting shapes. Did you know the needle of a compass is a magnet? Fact. If you put the north end of a magnet near the north end of another magnet, they will push each other away.

所有磁铁都有南极和北极。 当你把一块磁铁的北极靠近另一块磁铁的南极时，它们会吸 在一起。 这是因为磁铁的异极会相互吸引。 你把滚珠放在磁力棒之间，就能拼出有趣的造型。 你知道吗？指南针的指针就是一块磁铁哦。 冷知识：如果你把一块磁铁的北极靠近另一块磁铁的北极，它们会 互相推开。

How does a magnetic drawing board work? You write on a magnetic drawing board with a magnetic pen. You move the sliding magnet up and down to rub out what you have written.

磁性画板是怎么运作的呢？ 你用磁力笔就能在磁性画板上写字。 你上下滑动磁性擦除条，就能擦掉你写的内容。

Inside a magnetic drawing board. The screen has three parts. The front and back parts are pieces of plastic. The middle part is also plastic and looks like a honeycomb. It is filled with a thick liquid. In the liquid are tiny magnetic pieces. When you draw on the front screen with the magnetic pen, the pieces are attracted to the top of the liquid. This means that you can see them through the screen. When you move the sliding magnet up and down, the magnetic pieces are attracted to the bottom of the liquid. This means you can't see them, so the screen is clear. Did you know? Magnetic drawing boards are waterproof, so divers can use them to pass messages to each other underwater.

磁性画板的内部结构： 画板屏分为三层。 最上层和最下层都是塑料片。 中间层也是塑料做的，看起来像蜂窝。 中间层里装满了浓稠的液体。 液体里有细小的磁性碎屑。 当你用磁力笔在画板正面写字时， 磁性碎屑会被吸到液体的上层。 这样你就能透过画板看到这些碎屑啦。 当你上下滑动磁性擦除条时， 磁性碎屑会被吸到液体的底层。 这样你就看不到它们了，画板就变干净啦。 你知道吗？ 磁性画板是防水的， 所以潜水员可以在水下用它们互相传递信息。

How does a friction car work? A friction car moves by itself if you rub the wheels along the ground, then let it go.

惯性车是怎么运作的呢？ 如果你把惯性车的轮子在地面上摩擦几下再松开，它就会自己跑起来。