Design and testing of these physical systems rely on standard design practices that employ the laws of conservation of force, mass, and energy.
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。
In the physical world there exist a number of conservation laws, some exact and some approximate.
物理世界中存在着一些守恒定律，其中有些是严格的，有些是近似的。
The numerical results show that the different physical hierarchy truncations in Two-Body Correlation Transport Theory (TBCTT) are all compatible with conservation laws.
数值计算表明：两体关联输运理论在不同的等级截断下均较好地保持了有关的守恒定律。
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