But there is another possible explanation of the Italian puzzle: that sleep is not necessary for memory after all.
但是，对于这个意大利谜题还有另外一种解释：睡眠无益于记忆。
More likely, the researchers speculate, humans use their fine hearing to facilitate working memory and learning capa bilities, but more research is needed to explore this puzzle.
最后，研究者推测，也许人类只是用他们的好听力去促进他们的记忆容量以及他们的学习能力，但是仍然需要更多的研究去探索这个难题。
In two further experiments the effect of participant's lucky charms on both memory and puzzle-solving was tested.
在两个进一步的实验中，科学家检验了幸运符对记忆和难题解决起的作用。
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