If you have two circles and one rectangle, what can you do with them? 如果你有两个圆和一个矩形，你能用它们做什么？

　　You can make a cylinder. 你可以做一个圆柱体。

　　A cylinder has two circular shapes on the bottom and top and long straight sides. 圆柱体在底部和顶部有两个圆形，还有一个长直边。

　　Many things around us are shaped like cylinders. 我们周围的许多东西都是圆柱形的。

　　A roll of toilet paper, a salt can and a water glass, usually have cylinder shapes. 一卷厕纸，一个盐罐和一个玻璃水杯，通常是圆柱形的。

　　To be a cylinder, the sizes of the circles on the bottom and the top should be exactly the same. 作为圆柱体，底部和顶部的圆应该大小完全一样。

　　Can you make a cylinder? 你能做一个圆柱体吗？

　　If you make a cylinder with thick paper, you can keep things in it. 如果你用厚纸做一个圆柱体，你可以把东西放里面。