解决实际困难，点燃希望之火。“对于残疾人来说，精神的引领尤为重要。”李莉积极组织各种学习活动，请老师来讲课，让残疾朋友在精神的引领中找到自身价值。
One clever approach is to place an upper bound on the number of times that a ZK credential can be used. For example, we might wish to ensure that a credential can be “shown” at most N times before it expires. This is analogous to extracting many different single-use credentials, without the hassle of having to make the Issuer and User do quite as much work.
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