大家都已经见过蜻蜓吧，而且也已经知道蜻蜓是什么颜色的，有绿色、有红色，就是这两种了。
Everyone has seen dragonflies, and we already know what colour they are. They are green and red. That's the two kinds of dragonflies.
为了弄清楚，早在10年前科学家就对蜻蜓做了第一次实验，实验证明有两种可能性。而另一些科学家也得到了结论，一种是把蛋放到水下到了一定得时间那些蛋就会慢慢浮到了水面上就慢慢变成了蜻蜓。二种是准备下雨时由于蜻蜓在上空太闷热了要飞下来把后面点到收取这样就会两开多了，还有是预告人们大雨就要来临了。
To make it clear, scientists did their first experiment on dragonflies 10 years ago, and the experiment proved that there were two possibilities. Other scientists have also come to the conclusion that one way is to put eggs underwater for a certain period of time, and those eggs will slowly float to the surface of the water and gradually become dragonflies. The second is to prepare for rain because the dragonfly is too hot in the sky to fly down and point the back to collect so that it will be more than two open, and also to predict the coming of heavy rain.
还有很多奥秘等着我们去发现呢!
There are many mysteries waiting to be discovered.