我将以强调两点特征开始会话，自我觉得对于帮助老师们在教室里开始使用wiki很关键的两点：1 .免费，2 .简单。

I'll start the conversation by highlighting two features that I feel are key to helping teachers get started with using wikis in their classrooms: 1 the cost of 'free' 2 simplicity.

youdao

So this was a bit of joke and surprise made them angry about this convergence. Then something even worse happened. People started to talk about using the internet to carry voice conversations for free.

所以这有种开玩笑和惊奇的意味,使他们对聚合很生气，而后更,糟糕的事发生了，人们开始谈论关于,使用互联网免费传输声音会话。

麻省理工公开课 - 媒体、教育、市场课程节选