求翻译：国外先进的数控成形磨齿机普遍采用了砂轮自动对刀、自动修整、在线测量及智能纠正等先进技术，高精度、高效率、功能复合及大型化成为趋势，磨齿精度已稳定达到3～5级是什么意思？

Advanced CNC forming grinding wheel widely used automatic knives, automatic repair, on-line measurement and intelligent correction and other advanced technology, high-precision, high efficiency, large-scale functional composite and a trend has been steady grinding precision of 3 ~ 5

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The overseas advanced numerical control forming gear grinding machine has used the grinding wheel generally automatically to the knife, the automatic conditioning, the online survey and the intelligent correction and so on the vanguard technology, the high accuracy, the high efficiency, the function

Advanced CNC form grinding machine commonly used wheel automatic on-line measurement and intelligent tool, automatic trimming, corrective, and other advanced technology, high accuracy, high efficiency, complex and large become trends, gear grinding accuracy already achieved level 3~5

Foreign advanced numerical control take shape machine of tooth rubed adopt emery wheel automatic knife, repair, measure and intelligence person who correct advanced technology online automatically correctly generally, high precision, high efficiency, function are compounded and the maximization beco