〔R54〕  With thieves I consort,

                With the vilest, in short,

                 I'm quite at my ease in depravity;

                 Yet all divines use me,

                 And savants can't lose me,

                 For I am the center of gravity.

〔譯註〕 跟小偷我同伙，

跟最壞的，簡短說，

我十分舒坦，在墮落；

不過，所有神學家都用我，

而博學之士不能失去我，

因為重力的中心就是我。

〔提問〕 If I am a letter in the alphabet, what is the letter?

〔謎底〕 _