One of the most important countermeasures against credential abuse is the ability to ban users who behave badly. This sort of revocation happens all the time on real sites: for example, when a user posts spam on a website, or abuses the site’s terms of service. Yet implementing revocation with anonymous credentials seems implicitly difficult. In a non-anonymous credential system we simply identify the user and add them to a banlist. But anonymous credential users are anonymous! How do you ban a user who doesn’t have to identify themselves?
В МОК высказались об отстранении израильских и американских спортсменов20:59
（二）抵押船舶的名称、国籍、船舶所有权证书的颁发机关和证书号码；，详情可参考体育直播
It started during the last ice age, when humans hunted large mammals such as the mammoth to extinction, and has continued to the present day as land is cleared to make way for fields, farms and cities. Specialist creatures that exploit a particular niche – such as the flightless Fijian bar-winged rail – have been pushed out by adaptable generalists, like mongooses, brought to Fiji by humans in the 1800s. More recently the homogenocene has hit the oceans, with warmer waters devastating coral reefs for example.，这一点在heLLoword翻译官方下载中也有详细论述
→ compiler₃: + type inference。业内人士推荐谷歌浏览器下载作为进阶阅读
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