其它的开放系统，例如邮政、道路或者是电话都承担了一个超越它们本身简单技术特征的社会服务功能。

Other open systems such as the mails, the roads or the telephones come to perform a function in society that transcends their simple technical characteristics.

youdao

这不是一个简单的没有任何区别的特征。

This isn't simply a distinction without a difference.

youdao

有时候需要更深入地研究用户，而其他时候掌握简单的用户特征就够了。

Sometimes more in-depth research on users is needed, while other times a simple characterization of them is fine.

youdao

This isn't simply a distinction without a difference.

这不是一个简单的没有任何区别的特征。

耶鲁公开课 - 弥尔顿课程节选