If the resumption of diplomatic ties between China and the United States by way of ping-pong diplomacy is described as'earth-shattering and heaven-battering',then the process of forging a profound friendship between China and Japan through ping-pong can be said to be gentle and gradual.From Goto Koji to Koji Kimura,from Kimiyo Matsuzaki to Ai Fukuhara,the gentle stream of the friendship between