在昨天发布的报告当中，美国国家医学院提出了一个解决方案：简单说来，就是给食品设定标准化评级-在每个食品的包装袋上标上0颗到3颗星或者审核标记。
The Institute of Medicine offered a possible solution in a report released yesterday: put a simple, standardized rating—zero to three stars or checkmarks—on every food package.
如果任何处理常式设定标示快取回应为无效的旗标，该项目都将标记为无效并且从快取中清除。
If any handler sets a flag indicating that the cached response is not valid, the entry is marked as not valid and expelled from the cache.
如果任何处理常式设定标示快取回应为无效的旗标，该项目都将标记为无效并且从快取中清除。
If any handler sets a flag indicating that the cached response is not valid, the entry is marked as not valid and expelled from the cache.
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