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.
纯粹的函数性语言不依赖保存或检索状态的操作，因此不允许破坏性赋值。
Pure functional languages do not rely on operations that save or retrieve state and do not allow destructive assignments.
可以根据需要多次保存、检索、重新运行卸载作业。
Unload jobs can be saved, retrieved, and rerun as many times as necessary.
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