〔R59〕 I walk with you each pleasant day;
I chase the children when at play.
They cannot catch me if they try.
Yet they are as fleet of foot as I.
〔译注〕 每个愉快的日子，我都跟你一起走路；
当玩耍的时候，我跟小孩在追逐。
他们抓不到我，就算他们试着来，
可是，他们却跟我一样脚步快。
〔提问〕 If I am a shade or dark image, what am I?
〔谜底〕 sh____