• 1. approximate expansion: 近似展开式
• 2. two-scale approximate expansion: 双尺度渐近展开式

• 1.The nonlinearity of the performance function reduces the errors because of the derivation and the approximate expansion.
  对于功能函数的非线性，避免了求导或近似展开而产生的误差。
  dict.yoduao.com
• 2.Currently, these foresee an approximate eightfold expansion within just nine years.
  计划的核电项目在九年内会比目前的数量翻八倍之多。
  dict.yoduao.com
• 3.The new method firstly obtains two approximate rotational invariance relations about distributed sources central DOA by the Taylor series expansion of array steering vector.
  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。
  dict.yoduao.com

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