正如其前身，现代银行必须保证可用性，要按需支付，要有相当数量的现金和在央行的保证金。
Like its predecessor,the modern bank must keep available, to make payment on demand, a considerableamount of currency and funds on deposit with the central bank.
所有这些使得它成为一种实际可用的的支付系统的条件是：服务提供商必须要将唯一识别符与银行帐号或者信用卡链接起来。
All that's required to turn this system into a reliable payment mechanism is a service provider willing to link that unique identifier to a bank account or credit card.
通常，组织机构对高可用性目标有不恰当的预期，他们想要比他们实际愿意支付的更高级别的可用性。
Often, organizations have inappropriate expectations regarding availability targets, and they might demand higher levels of availability than they are actually willing to pay for.
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