在这个情况下是泰勒近似，如果我没记错的话。
Which in this case was Taylor's approximation, if I remember right.
新方法首先通过阵列方向矢量的泰勒级数展开获得关于分布源中心DOA的两个近似旋转不变关系。
The new method firstly obtains two approximate rotational invariance relations about distributed sources central DOA by the Taylor series expansion of array steering vector.
利用泰勒级数导出了阿基米德齿轮滚刀造形误差的近似公式。
This article USES Taylor Progression to figure out the approximate formula of the forming errors of Archimedes gear hobs.
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