求翻译：但是在学习这些一段时间后，由于没有及时的复习或者说没有经常应用，当我们想要利用这些早已经学过的知识时，才发现能够调动出我们脑海并供我们利用的知识以及所剩无几了是什么意思？

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However, in learning these after a period of time, because there is no timely review or do not have regular applications, when we want to take advantage of these had already learned the knowledge that we will be able to mobilize the mind and the knowledge for our use as well as the few remaining

But after studies these period of time, because does not have the prompt review or said frequently has not applied, when we want uses these already study of the knowledge, only then discovered could transfer our mind and the knowledge which use for us as well as is not much left

But after learning of these for some time, as there is no review in a timely manner or that the absence of regular application, when we want to use those already learned knowledge, only to find and able to mobilize our minds we can take advantage of knowledge and there

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