通常需要密码以识别卡的有效使用者，如在提款机上使用的卡。
Password generally requested to identify the effective user of a card, i. e. at the cash point machine.
事实也的确如此，但是最有效的分配流量方式应该是向重度使用者收取更高的费用，可康卡斯特公司并没有选择这么做。
It was. But the most efficient way to allocate bandwidth among customers is to charge heavy users higher prices, which Comcast chose not to do.
问题不是信息通道的便捷性，而是网络使用者并不总能理解这些信息，并评估其有效性。
The problem is not the ease of access to information, but that Web users cannot always interpret this information and assess its validity.
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