数值微分法 meaning in English

numerical differentiation

In the text , differential coefficient method and numerical value differential coefficient method have been introduced for crank slide block machine accuracy analysis , and influence of the fitting clearance of moving pair to component moving error has been given
文章介绍了微分法及数值微分法曲柄滑块机构精度分析，说明了运动副的配合间隙对构件运动误差的影响。