first-order approximation 一次近似
first order approximation 第一级近似
high-order approximation [统计] 高阶近似
second-order approximation 二阶逼近
first-order approximation method 一次近似
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。
The zeroth order approximation of the solution can be expressed in terms of confluent hypergeometric functions.
解的零级近似可以用汇合超几何函数表示。
The result verifies that the high order approximation method offers better denoising effect and higher signal to noise ratio.
结果证明，相对于其他方法，高次逼近法去噪效果良好，得到的信噪比更高。
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