The crystallographic nature of cutting force variation was analyzed based on crystal plasticity.

作者还根据晶体塑性力学理论，分析了产生这种变化的根源。

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Objective To investigate the force variation during the anterior cervical surgery while distracting the cervical vertebrae and analyze its causes.

目的研究颈椎前路手术椎间撑开力的变化及其原因。

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So the research in this paper is about the internal force variation rule of the frame-supported beam of wall body, which based on some mature investigative experience at difference models.

因此本文的内容主要是在总结一些成熟的研究经验的基础上，对有开洞墙体的框支梁在不同的结构条件下其内力变化的规律进行研究。

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While it is difficult to compare police forces which are dealing with diverse geographic areas, the results point to a significant variation across the UK - even for different areas served by the same force.

BBC: Do government cuts mean some now 'dial 999 and wait'?