No one truly knows what dreams actually are with theories suggesting that they're brain's way of filing away memories or shutting down to deal with physical or mental stress.

没有人说的清楚梦到底是什么，有的理论说梦是把记忆归档，或者清除来缓解生理和心理压力的一种方式。

One of these unknown phenomenons are dreams. No one truly knows what dreams actually are with theories suggesting that they're brain's way of filing away memories or shutting down to deal with physical or mental stress.

这些未知现象之一就是梦。没有人真正知道梦到底是什么，理论认为梦是大脑归档记忆或关闭以应对身体或精神压力的方式。