著名爱尔兰诗人叶芝(William Butler Yeats,1865-1939)29岁时曾写过一首爱情诗,全诗如下:When You Are OldWhen you are old and gray and full of sleep,And nodding by the fire,take down this book,And slowly read,and dream of the soft lookYour eyes had once,and of their shadows deep;How many loved your moments of glad grace,And loved your beauty with love false or true,But one man loved the pilgrim Soul in you,And loved the sorrows of your changing face;And bending down beside the glowing bars,Murmur,a little sadly,how Love fled,And paced upon the mountains overhead,And hid his face amid a crowd of stars.这首诗的写作背景如下:1889年,