Tracing the identities of those who post such illicit material on social-networking sites, mostly based overseas, may prove impossible.

许多此类社交网站的据点在国外，追踪这些不实信息发布者的身份几乎不可能。

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On the base of the constant removal rate of the metal material, the motion model of tangential point tracing grinding of Non-round parts should be given respectively according to type of the parts.

基于恒金属去除率的原则，根据零件的特点分别建立了非圆零件切点跟踪磨削的运动模型。

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The program allows tracking, tracing, storage and analysis of all supply chain data, including material flow, quality, ore type and other information.

程序允许跟踪，存储和分析所有供应链数据，包括物料流动、质量、矿石类型和其它信息。

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