求翻译：家里的菜刀、镰刀、斧头等刀具要经常用手工去磨，董荣刚感到非常麻烦，很浪费时间。能不能发明一种自动磨刀的机器呢？董荣刚就开始着手研制。2003年，他发明了自己的第一代十字磨刀机。随后经过不断改进，他申报的“双面磨刀机”于2009年2月1日通过国家知识产权局的初审。是什么意思？

Home kitchen knives, sickles, axes and other cutting tools often by hand grinding, Dongrong Gang are very troublesome, it is a waste of time. Can not invent an automatic sharpening machine? The Dongrong Gang began to develop. In 2003, he invented the first generation of cross Knife Sharpener. Then c

正在翻译，请等待...

正在翻译，请等待...

Home tools such as choppers, sickle, axe, often by hand, grinding, Dong Ronggang is awkward, and is a waste of time. Could you invented an automatic knife grinding machine? Dong Ronggang begin research. In 2003, he invented his first generation cross knife grinding machines. Then through continuous