孩子到了三四岁，就可以带他们观察月亮了，这是自然界里变化最明显又最有规律的现象。听了这个故事，让孩子注意看月亮什么时候胖，什么时候瘦，什么时候不见了，它是不是真的穿上大衣了？

When children reach the age of three or four, you can take them to observe the moon, which is the most obvious and regular phenomenon of change in nature. Listen to this story and ask your child to pay attention to when the moon is fat, when it is thin, when it is gone, and if it is really wearing a coat.