谷歌的,比金山词霸更强大
http://translate.google.com/
Planetary nebulae are stars like the sun to terminate the life of the great last-minute show, beginning when the star dies, first into a red giant, and then evolve into planetary nebulae. In essence, a number of planetary nebulae are dying stars out of dust and gas shells, the diameter of generally about 1 light-years. Around our sun at the beginning of death within 50 million years, eventually will become a red giant. Although the life span of planetary nebulae, only an average of about 3 million years, but to help re-integration into the next generation of chemical elements in stars.
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