如果没有发现该属性，或者已经过期了，应用程序不得不调用后端来获取属性，把它保存到EPPS，并且返回该属性。
If the property is not found, or is expired, the application has to call the backend to get the property, save it to EPPS, and then return the property.
我们觉得，他可能已经把它放在银行的一个保险箱里或者其他的什么地方！
We thought that he might have put it in a security box in the bank or something!
内部化帮助研究人员就一个问题或者感兴趣点进行交流，并针对已经通过外部化获取的知识群体把它勾画出来。
Internalization helps a researcher communicate a problem or point of interest and map that against the bodies of knowledge already captured through externalization.
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