from memory

基本解释

Chiefly, testing yourself repeatedly before an exam teaches the brain to retrieve and apply knowledge from memory.
首先，在考试前反复测试自己，这样能够教会大脑从记忆中找回及运用知识。
If you do not require such dynamic loading, you can preload your application with entities that you wish to be read from memory.
如果您不需要动态装载，那么可以将应用程序与想要从内存中读取的实体一起装载。
When the connection to the primary DB2 server fails, DB2 will retrieve the alternate server information from memory and will use that alternate server information to connect to the right DB2 server.
如果到主要 DB2 服务器的连接失败，DB2 将从内存中检索备用服务器信息，并将使用该备用服务器信息连接到正确的 DB2 服务器。

But learning so much of it in such a short time, that's a big scramble -- and they have to know it from memory."
So now let me recreate this program from memory.
现在我们在脑子里再过一遍这个程序。
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The repetition of symbols was to be enough, without trauma, as well, perhaps, to attenuate it, or even jar it altogether loose from her memory.
象征的重复快要足够，即便没有可能的从她记忆中流出的创伤，去减弱它去刺激它。
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Also derived from memory, they have the gritty, driving force of a personal pathology.
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If you say something, such as a poem, or sing a song from memory, you speak or sing without looking at any words or music.