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The net momentum is the vectorial sum of these two, which is this.
总动量为，两者的矢量和，也就是这个东西。
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Therefore there is a total angular momentum which is the vectorial sum of the two.
因此，总的角动量,有两个向量。
Numerical and vectorial analysis Differential calculus: multivariable functions.
数值和矢量分析微分：多变量函数。
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