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.
时隔不久就有成千上万的人因为它的免费而开始使用这个服务。
Soon, thousands of people were using their service because it is free.
时隔不久就有成千上万的人因为它的免费而开始使用这个服务。
Soon, thousands of people were using their service because it is free.
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