第一辆自行车发明者英语作文.60字

Lu about was born in this surname 507 BC to lose,name class。Because he is LuGuoRen,so people milnwood lu。Some books for or to lose a writing autumn plate。He is engaged woodworking work。When people to make trees to become already flat and smooth board,still do not have what good method。Lu in practice watched,imitate biological form,invented a lot of woodworking tools,such as saws,a plane,etc。How is the invention saws lu?According to legend once he into deep cut trees,carelessly,hand was a kind of grass leaf blade,he ripped off lightly touched,originally leaves both sides have 8-cm-long teeth,and his hand was these small teeth ripped,he also saw in a tree on there is a important weeds locust,two big BanYa also lined by many small teeth,so can quickly grinded blade。Lu from these two things got a inspiration。He thought,if such dentate tools,isn't also can quickly sawed through trees!Hence,he after many tests,finally invented the sharp saws,greatly improving the working efficiency 再问： 自行车的