这些物理系统的测试依赖于对作用力、质量和能量守恒定律的标准设计实践。

Design and testing of these physical systems rely on standard design practices that employ the laws of conservation of force, mass, and energy.

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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。

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.

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在任何时候，看板(相当于系统中的“能量”)的最大数量都与在制品的上限保持守恒。

The maximum number of Kanbans (the "energy" in the system) is fixed and physically conserves the upper limit of WIP at any given time.

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So claims that--about the failure of conservation in children at different ages could be easily tested and systematically tested, and in fact, there's a lot of support for them.

关于不同年龄阶段的儿童,缺乏守恒概念的论断,能够很轻易的得到系统的检验,事实上,有相当多的证据支持这些论断

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