求翻译：依据切比雪夫最佳逼近基本理论，推出了2个绝对值意义下的曲线拟合准则及相应的计算方法：（1）极小化最大绝对误差准则，并构成了极小极大曲线拟合法。它主要用于解决包括非线性和多变量条件下的一般曲线拟合问题；（2）极小化最大相对误差准则，并构成了相对误差极小极大曲线拟合法。它主要用于需要相对误差作为衡量标准的场合，具有较大的适用范围。文中通过生命体变化的实例，介绍了这2种曲线拟合的计算方法。是什么意思？

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