Only if a cached copy cannot be found or has expired is the YQL query executed, and the results again are saved to the cache for future use.
仅当无法找到缓存副本或缓存副本过期时才执行YQL查询，结果再次保存到缓存以备将来使用。
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.
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.
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。
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