Thedragonflydoesoverthemajorcontributiontothemankind,itwantstoeatupalotofmosquitosfromcradletothegrave,thisisstillinsignificant,mainlyisitsbodystructuretoinspirebyimportanceformankind,naturally,onceweseeit,thenaturewouldremindofhelicopter,difficultwaybothhavewhatcontactbyallmeans?That'sright,thedesignersofhelicopterbeatstudieddragonflyagainandagainofwingafter,passbytoimprovecontinuouslyfunctionofmakingthehelicoptertojustattainperfectresult.蜻蜓对人类做出过重大贡献,它的一生要吃掉很多蚊子,这还微不足道,主要是它的身体结构给人类以重要启迪,不用说,我们一看见它,就自然会想起直升飞机,难道两者之间有什么必然联系吗?没错,直升飞机的设计师们就是在反复研究了蜻蜓的翅膀后,经过不断改进才使直升飞机的性能达到完美效果的.我的宠物是一条可爱的狗.它的名字是"点点".因为有很多黑的圆圈在它的皮肤上."点点"是非常友好的.许多孩子喜欢和它玩.他的喜爱食物是肉骨头.他的喜爱玩具是玩偶."点点"喜欢非常跑.它跑得非常快速并且它有一个女朋友.它的名字"娜娜".它的皮肤也有很多黑圈子.我非常喜欢我的宠物.这是一只好宠物!Mypetisalovelydog.Itsnameis"diandian".becausetherearealotofblackcircleonitsskin.the"diandian"isveryfriendly.Manychildenlikeplaywithhim.Hisfavouritefoodismeatbones.Hisfavouritetoyisadoll.'diandian'likestorunverymuch.Itcanrunveryfastandithasagirlfriend.itsname"nana".Therearealotofblackcircleonitsskin,too.Ilikemypetverymuch.Itisagoodpet!Ihaveadog,hisnameisJoy.Heisverylovelylikeotherdogs.Whenhefeelshappy,healwayswagshistail.Whenhewantstoeatfood,heoftenfollowsmeuntilIgivehimsomethingtoeat.Ireallylikehim.WhenIfeelsad,heoftenstayswithmeasifheknewwhyIwassad.Thankstohim,heputsmeoutofmymisery,sothatIcanlivehappily.Heletmeknowdogsarehuman'sbestfriends.Mypetisalovelydog.Itsnameis"diandian".becausetherearealotofblackcircleonitsskin.the"diandian"isveryfriendly.Manychildenlikeplaywithhim.Hisfavouritefoodismeatbones.Hisfavouritetoyisadoll.'diandian'likestorunverymuch.Itcanrunveryfastandithasagirlfriend.itsname"nana".Therearealotofblackcircleonitsskin,too.Ilikemypetverymuch.Itisagoodpet!