〔R71〕  It is not a food to be swallowed.

                But food is there for swallows.

                It is a place built not for pests nor in jest.

                It's what swallowers are not to come and molest.

〔譯註〕 它不是要被吞噬的食物，

可是食物就在那裡給燕子。

建那地方不給壞蛋也不開玩笑，

那個就是不要吞噬者來干擾。

註：swallow  指「燕子」或「吞噬」，

pest  是指令人厭惡之人 或 物，有時指害蟲、毒物。

〔提問〕 If it is the best place for birds to stay, what is it?

〔謎底〕  n___