簡單介紹一種動物并說說給人們帶來了什么好處
先介紹一種動物，再說明利用該動物的特點，人們發明了什么。
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。
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