riddle

这个谜语的答案就藏在问题本身中。

The answer to this ___riddle is hidden within the question itself.

在灯会上，游客们常常尝试猜谜语。

At a lantern fair, visitors often try to guess a ___riddle.

那艘船的失踪仍是一个未解之谜。

The disappearance of the ship remains a ___riddle.