...筑工程学院结构力学教研室 北京建筑工程学院结构力学教研室 主桁架 纵梁 横梁 注：轴力又称为主内力（primary internal forces）。
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primary internal forces
初级内力
以上为机器翻译结果，长、整句建议使用 人工翻译 。
But companies need to carefully consider their partners so that they can minimize regulatory objections and internal conflicts, all of which may overshadow their primary reasons for joining forces.
FORBES: Utility Mergers Rising but Picking Partners is Tricky
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