They delight small children because they have strong rhyme and rhythm and have a lot of repetition 这些童谣能使孩子们快乐，因为它们节奏感强，又押韵，而且重复多遍。
2.
We can solve the question of the source of the tune sandhi on the character " one " through the comparison with the tones of " rhyme and rhythm of the central plains " and the interchangeability in modem pekingese , and find a position for this kind of interchangeability in the orders of tone sandhi 通过与《中原音韵》声调和现代汉语北京话变调的比较，我们可以解决“一”字变调的来源问题，同时在变调的序列里为这种通假找到一个位置。
