first-order approximation 一次近似
first order approximation 第一级近似 ; 第一位近似值
high-order approximation [统计] 高阶近似
second-order approximation 二阶逼近
first order approximation theory 一次近似理论
Therefore, it is easy to calculate any high order approximation by hand or by a computer.
因此本法易于手算和用计算机计算，从而可求任意高阶近似。
Dr Worm acknowledges that the figures are "only a first order approximation" but says that if anything they are conservative.
Worm博士承认这些数据只是一阶近似，但他认为如果没有什么区别的话，这些数据已经是保守的了。
Nonlinear directly estimating formula for exponential curve which, through fixed point, was derived, by using first order approximation of Taylor expansion.
运用泰勒展开的一阶近似估计推导过定点的指数曲线的非线性直接估计公式。
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