面对那些对网络世界不开窍的人，电子邮件服务提供商需要保证从真实世界的场景到因特网上的场景转变是流畅的，不易察觉的。

Email service providers must allow for a smooth transition from a real world scenario to the Internet, for those who are petrified of it.

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关于工具，一个最重要的，也是最不易察觉的方面是，工具对使用此工具的人的习惯的潜移默化的影响。

A most important, but also most elusive, aspect of any tool is its influence on the habits of those who train themselves in its use.

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今天，有数以百万的人在使用网路，并且这个数字还在急剧增加中。然而，这样一个虚拟的群体常常是不易察觉。

Millions of people are on-line today and the number is rapidly growing - yet this virtual crowd is often invisible.

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