I'd like to return to gravity and work on a three-dimensional situation.
回到重力上，考虑一个三维问题。
Analysis of three-dimensional magnetic field is the foundation work for optimum design of electromagnetic system.
其三维磁场分析是电磁系统优化设计的基础。
Analysis of three-dimensional magnetic field is the foundation work for optimum design of electromagnetic system.
其三维磁场分析是电磁系统优化设计的基础。
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