When you are asleep, the brain decides what information you should move to your long-term memory and what should be unlearnt.

当你睡着时，大脑决定你应该将哪些信息转移到长期记忆中，哪些信息应该被遗忘。

He was one of a dying-out generation who retained the principle, nearly unlearnt now, that a man's habiliments should be in harmony with his environment.

他是垂死的一代人中的一员， 他保留了一个人的衣着应该与他的环境相协调的原则， 现在几乎已经忘却了。