A fundamental law of physics holds that momentum is always conserved, meaning that unless some outside force enters a system, its total momentum must stay constant.
物理学一条基本定律认为动量守恒，也就是说，除非外力进入系统，否则总动量一定保持不变。
Rural credit union constitutes an important part of Chinas financial system and serves as a fundamental force in rural finance.
农村信用合作社是我国金融体系的重要组成部分，是农村金融的基础力量。
Companies advocating "technology as the driving force, the quality of the core, service as a fundamental" spirit of enterprise, with strong technical force and strong sales service system.
公司崇尚“科技为动力、质量为核心、服务为根本”的企业精神，拥有雄厚的技术力量和强大的销售服务体系。
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