地球是太阳系中唯一有生命存在的行星，你知道是什么原因吗？
The solar system
In the galaxy－of its solar system inside，conceive the life，that life the planet，is the Earth.The Sun gives out lights to have fever，its shining glory，good enough to illuminate whole solar system！In regard to life，want to exit，must have the position just right of the water，the Earth around the Sun，not cold not hot.The water can reserve over a long period of time at on the earth，the living creature is just can multiply greatly.
