〔R26〕  At night they come without being fetched, and by day they are lost without being stolen.

〔譯註〕 晚上它們沒有被延請卻自己來，而白天時它們沒有被偷卻自己失掉。

                       註： fetch  指「拿、取、接、延請」。

〔提問〕 If they are heavenly bodies (天體), what are they?

〔謎底〕  s____