The real-time cooperative editing systems is an important application in the field of CSCW. It has three characteristics: real-time, distributed and unconstrained.
实时协同编辑系统是一类重要的CSCW 应用系统，具有实时性、分布性和无约束性三个特点。
A website or web service is most appropriately implemented with Ruby on Rails when it has the following three characteristics.
当一个网站或网路服务有以下三个特点的时候，最适合采用Ruby on Rails方案。
When the crystal size is about three nanometers (billionths of a meter), the material has its ultra-strong and ductile characteristics.
当晶体大小大约为3纳米（1纳米等于10亿分之一米）时，天然丝材料具有超强的强度与延展性特征。
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