The dragonfly does over the major contribution to the mankind,it wants to eat up a lot of mosquitos from cradle to the grave,this is still insignificant,mainly is its body structure to inspire by importance for mankind,naturally,once we see it,the nature would remind of helicopter,difficult way both have what contact by all means?That's right,the designers of helicopter be at studied dragonfly again and again of wing after,pass by to improve continuously function of making the helicopter to just attain perfect result.蜻蜓對人類做出過重大貢獻,它的一生要吃掉很多蚊子,這還微不足道,主要是它的身體結構給人類以重要啟迪,不用說,我們一看見它,就自然會想起直升飛機,難道兩者之間有什么必然聯(lián)系嗎?沒錯,直升飛機的設計師們就是在反復研究了蜻蜓的翅膀后,經過不斷改進才使直升飛機的性能達到完美效果的.我的寵物是一條可愛的狗.它的名字是"點點" .因為有很多黑的圓圈在它的皮膚上."點點" 是非常友好的.許多孩子喜歡和它玩.他的喜愛食物是肉骨頭.他的喜愛玩具是玩偶." 點點" 喜歡非常跑.它跑得非?？焖俨⑶宜幸粋€女朋友.它的名字"娜娜" .它的皮膚也有很多黑圈子.我非常喜歡我的寵物.這是一只好寵物!My pet is a lovely dog.Its name is "dian dian".because there are a lot of black circle on its skin.the "dian dian" is very friendly.Many childen like play with him.His favourite food is meat bones.His favourite toy is a doll.'dian dian ' likes to run very much.It can run very fast and it has a girl friend.its name "na na".There are a lot of black circle on its skin,too.I like my pet very much.It is a good pet!I have a dog,his name is Joy.He is very lovely like other dogs.When he feels happy,he always wags his tail.When he wants to eat food,he often follows me until I give him something to eat.I really like him.When I feel sad,he often stays with me as if he knew why I was sad.Thanks to him,he puts me out of my misery,so that I can live happily.He let me know dogs are human's best friends.My pet is a lovely dog.Its name is "dian dian".because there are a lot of black circle on its skin.the "dian dian" is very friendly.Many childen like play with him.His favourite food is meat bones.His favourite toy is a doll.'dian dian ' likes to run very much.It can run very fast and it has a girl friend.its name "na na".There are a lot of black circle on its skin,too.I like my pet very much.It is a good pet!