The first one is a group contribution model for the prediction of the thermal conductivity of polymer melts.

首先，本工作开发了一基团贡献模型用于预测常压下聚合物熔体的导热系数。

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Based onthe molecular QCLC model, a group contribution quasi-chemical local composition model is proposed, in which polar molecule is divided into several non-polar functional groups.

本文在前文的分子模型基础上，提出了似化学局部组成的基团模型，可用于极性分子混合物申组分活度系数的预测。

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Increasing the number of group members can sometimes reduce the social pressure on each individual in the group, and actually reduce a given person's contribution.

有时增加成员数目反而会导致组中的每个人的社会压力降低，从而使个人对整体的贡献变小。

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"Nick Buckles made a massive contribution to the group over a 28 year career, " said G4S chairman John Connolly.

BBC: G4S chief executive Nick Buckles to step down

The Liberal Democrat group said the contribution had been "little more than a vanity project" for the Tory group.

BBC: Surrey withdraws ?5m offer to Runnymede Magna Carta plan

"Leon has been part of a close knit coaching group at Wasps for the last two and a half years, making a valuable contribution to the way we play, both in the forwards as a team, " he said.

BBC: Holden handed Wasps forwards role