验证器其实是协议元素（例如：实体标签（entity tag）或最后修改时间（last-modified time）等），这些协议元素被用于识别缓存里保存的副本（即缓存项）是否等价于源服务器的实体的副...
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This returns the alert along with a last-modified timestamp or entity tag.
这返回警报以及最近修改的时间戳或实体标记。
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The LEI would provide a unique identification tag for every financial services entity and perhaps extend to the financial instruments they issue.
FORBES: Lehman, Lithium and Lettuce -- The Need for Unique Identifiers in Finance
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