随着时间的推移，他们会发现其他的功能(像小组，导入Feed，以及保存的检索等等)，但是这些东西不会出现在最初的用户体验中。
Over time, they are able to discover other features (such as groups, saved searches, imported feed, etc), but those things aren't part of the initial experience.
能够较早进行自我测试的学生更善于从记忆中检索知识，并将其长期保存。
Students who can test themselves earlier will be better at retrieving the knowledge from the memory and keep it in the long run.
注册中心必须以一种明确定义的方式保存和检索数据以便数字签名不被破坏。
Registries must save and retrieve data in a well-defined way so that a digital signature is not broken.
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