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We need a variety of tools to cut goods in daily life ,which is very inconveniet,the production of tools must comsume a lot of raw materials and sources. The design makes a knife and a saw together into a scissor ,which combines all cutting functions into a tools,and it is portable and convenient to be used. It means that one tools has the functions of a variety of tools ,so needn't to buy a variety of tools ,it also saves a lot of sources.
Chen Yongjun Wang Zeng Chen Hongyu Wang Wei