A: A pointed tail sometimes causes waves of ripples on the water. Sometimes euphemistic cries fly all over the sky; Sometimes it flies by, leaving a black silhouette in the sky.
The second question, why can swallows dance freely and happily?
Because swallows don't stop dancing because of their temporary fame.
The third question, the author thinks, is how can human life dance freely and carefree like a swallow?
Get rid of the shackles of fame and fortune, get rid of the troubles of the eyes of the world, get rid of the heavy burden of the soul and dance freely and carefree.