Social collaboration, its tool and technologies have opened up a multi-fold channel of idea exchanges, knowledge creation, classification, and searching.
社会协作、工具和技术疏通了想法交流、知识创建、分类和搜索的多种渠道。
Key points: classification of fault and fold.
重点：褶皱和断层的分类。
Key points: classification of fault and fold.
重点：褶皱和断层的分类。
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