宇宙 地球 生命英语演讲~字数在朗读2分钟左右~

宇宙 地球 生命英语演讲~字数在朗读2分钟左右~

The Origin of the Universe,Earth,and Life
For those who are studying the origin of life,the question is no longer whether life could have originated by chemical processes involving nonbiological components.The question instead has become which of many pathways might have been followed to produce the first cells.
Will we ever be able to identify the path of chemical evolution that succeeded in initiating life on Earth?Scientists are designing experiments and speculating about how early Earth could have provided a hospitable site for the segregation of molecules in units that might have been the first living systems.The recent speculation includes the possibility that the first living cells might have arisen on Mars,seeding Earth via the many meteorites that are known to travel from Mars to our planet.
Of course,even if a living cell were to be made in the laboratory,it would not prove that nature followed the same pathway billions of years ago.But it is the job of science to provide plausible natural explanations for natural phenomena.The study of the origin of life is a very active research area in which important progress is being made,although the consensus among scientists is that none of the current hypotheses has thus far been confirmed.The history of science shows that seemingly intractable problems like this one may become amenable to solution later,as a result of advances in theory,instrumentation,or the discovery of new facts.