niuniu said to herself,一不小心滑到水盆里出不来了,为什么呢?niuniu thought for a long time, niuniu looked up to see the moon in the sky,水盆中的月亮,天上到处都是亮晶晶的星星,想起光学知识,大自然真奇妙,她恍然大悟,summer night,突然,妞妞百思不解,” niu niu finds that there is also a moon in the water basin. niu niu is s