周健工：在哈萨比斯身上能感觉到更多真诚的东西。在《哈萨比斯》这本书里面，作者马拉比用了大量的对话，这是跟马拉比其他书不同的地方。你可以从他跟哈萨比斯私下里大概有30多个小时的对话，感觉到哈萨比斯发自内心的很多想法。
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This serial number check can be done using a simple local database at the Resource (website). Things get a bit more complicated if there are many Resources (say different websites), and you want to prevent credential re-use across all of them. The typical solution outsources serial number checks to some centralized service (or bulletin board) so that a user can’t use the same credential across many different sites.