无爪的猫杰克在树的底部嘶嘶作响，将熊搁浅了约15分钟。
Hissing at the base of the tree, Jack, the clawless cat, kept the bear at bay for about 15 minutes.
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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