... series of strata 层系 series of variable terms 变量项级数 series operation 串联运行 ...
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... 有效标记 significant notation 变项规则 variable rule 变项级数 series of variable terms ...
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Then series expansions of multi-variable functions are applied to the derived approximations in terms of phase angles to generate the approximations in terms of group angles.
然后连续利用多元函数级数展开，导出群角表示的相速度和群速度近似公式。
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