这是上世纪五六十年代的一篇挺有名的科学童话，很小的孩子也可以听懂。带孩子去看看苍耳和蒲公英，看它们像不像伞兵和刺猬，问问他们，还记得故事里说的，苍耳和蒲公英是怎样走到远处繁殖生长的吗？

This is a well-known scientific fairy tale from the 1950s and 1960s that even very young children can understand. Take the children to see the artemisia and the dandelion, ask them if they think they resemble parachutes and hedgehogs, and see if they can remember how the artemisia and the dandelion spread and reproduced in distant places, as mentioned in the story.