air

彰化縣溪州鄉溪州國小

Balloons expand when you fill them with air. 

當你幫氣球打氣時，氣球會變大。

Once the balloons are filled with air, you can use them to make all sorts of interesting designs. 

一旦氣球充滿空氣，你能做成不同有趣的造型。

The students learn about air in class.

學生在課堂上學習有關空氣的知識。

They use a toy to demonstrate the movement of air.

他們用玩具來示範空氣的運動。