Subtract a constant from a vector's magnitude (shorten the vector) without using square root?
减去一个常数向量的大小（缩短向量），而不使用平方根?。
When the hue difference increased, the magnitude of color shift in test target decreased, but the deflection Angle of color shift vector from constant hue line increased.
当诱导域与试验域之间的色调差增大时，试验目标色觉位移的幅值减小，而色觉位移矢量偏离恒定色调线的偏向角却增大。
If a scalar field changes slowly, it resembles a constant, both in its fixed magnitude and in its lack of directionality;
如果纯量场变化缓慢，它就会有固定的大小，而且没有方向性，就像一个常数一样；
While, the mean discharge magnitude increase first and after that it has an approximate constant with the increase of applied voltage.
间隙中的平均放电量随着空气间隙长度的增加而减小，随着施加电压的升高先增加后近似保持不变。
According to the maximum magnitude of the complementary sensitivity function, the filter time constant is calculated to assure the robustness of system.
根据闭环系统补灵敏度函数的最大值，从频域角度设计了滤波时间常数，以保证系统具有一定的鲁棒性。
When pressure is kept constant, the relationship between the magnitude of soil expansion and shrinkage deformations and the moisture movement appears linear.
当压力一定时，土的胀缩变形幅度与水分变化量呈线性关系。
When pressure is kept constant, the relationship between the magnitude of soil expansion and shrinkage deformations and the moisture movement appears linear.
当压力一定时，土的胀缩变形幅度与水分变化量呈线性关系。
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