为了得到三维坐标，使用特征点匹配的方法。
In order to get the 3d coordinate, feature points assigned manually were used.
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.
制造和利用工具是人类区别于其他动物的重要特征，然而最近英国的一项科学研究却发现，在这一点上人类其实并不孤单，新苏格兰乌鸦天生就具有一种制造和使用工具的能力。
Birds may not be renowned for their intelligence but New Caledonian crows have an instinctive ability to make and use tools, researchers said on Wednesday.
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