RNT files are a significant advance over their stain less steel hand counterparts with the caveat that care must be taken to prevent their fracture.是什么意思_RNT files are a significant advance over their stain less steel hand counterparts with the caveat that care must be taken to prevent their fracture.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句