Millions of years ago there were forms of life that no langer exist.

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• 英语翻译还有The sky is history是什么意思It takes a long time for light from the stars to come to earth.From the nearest star to earth,it takes about 4(1/2) years.From other stars,light can take millions of years to come to us!In the sky,we can see how the stars WERE many years ago,not how they are now.The earth from spaceFrom space,you can see that 71% of the earth is water.There is life on earth because it is not too hot or too cold and there is air.Is there li
• Millions of years ago there were forms of life that no langer exist.
• Millions of years ago there were forms of life that no langer exist.这是一个从句么？
• 怎么由1/u+1/v=1/f(u表示物距,v表示像距,f表示凸透镜的焦距）推出u+v等于大于4f.
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