但奥巴马先生的出生证上明明写着他生于夏威夷，而且至今没有人能找出一鳞半爪的反证。
Yet Mr Obama's birth certificate says he was born in Hawaii, and there is not a shred of evidence to the contrary.
任何时候当系统要求关于某个参与者的信息时—不管这个信息是确切的标识还是只鳞片爪的个别信息—这个参与者就被认为是一个已知的实体。
Anytime that a system requires information about an actor — whether that information is a precise identification or just some particular information — that actor is considered to be a known entity.
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