1.Life has a way.and yet.in absolute terms *The grammatical function of"and vet".It introduces a contrast. *Paraphrase this sentence:It is not difficult to determine whether a thing has life or not,but when it comes to give"lifea clear,complete,satisfactory definition,people find it extremely difficult. 2.In at least one instance,life has become profoundly self-aware. What sort of life can become self-aware? Only human life can be conscious of its identity.That is because only human being can think.So here life means human life. Why does the author say"in at least one instance So far we only know of the one particular case of human life.But,maybe there is life elsewhere in the universe.So"at least"is used here. Para.3 1.This is a one-sentence paragraph for emphasis.It serves as a transition,leading to life beyond earth 2.What else is alive out there? Is there anything similar to human life in other parts of the universe?Out there means in space beyond the earth. Para.4 1.There may be.to an answer At the turn of the new millennium of a thousand years one may not find anything which is scientifically unknown to human beings so intriguing and yet so difficult to answer as the issue of extraterrestrial life. 2.With instruments.a single inhabited world With the help of advanced technology such as Hubble Space Telescope scientists have discovered a very large amount of cosmic material and yet they have not discovered any life on any other planet. Para.5 1.the late astronomer.in our galaxy alone. By "technological civilizations",the author may mean civilizations with high technology.Carl Sagan,the astronomer who is now dead,predicted that there are a million societies with advanced technology in our galaxy,without taking into account other galaxies.1. Life has a way . and yet . in absolute terms *The grammatical function of “and yet”: It introduces a contrast. *Paraphrase this sentence: It is not difficult to determine whether a thing has life or not, but when it comes to give “life” a clear, complete, satisfactory definition, people find it extremely difficult. 2. In at least one instance, life has become profoundly self-aware. What sort of life can become self-aware? Only human life can be conscious of its identity. That is because only human being can think. So here life means human life. Why does the author say “in at least one instance”? So far we only know of the one particular case of human life. But, maybe there is life elsewhere in the universe. So “at least” is used here. Para. 3 1. This is a one-sentence paragraph for emphasis. It serves as a transition, leading to life beyond earth. 2. What else is alive out there? Is there anything similar to human life in other parts of the universe?Out there means in space beyond the earth. Para. 4 1. There may be . to an answer. At the turn of the new millennium of a thousand years,one may not find anything which is scientifically unknown to human beings so intriguing and yet so difficult to answer as the issue of extraterrestrial life. 2. With instruments . a single inhabited world With the help of advanced technology such as Hubble Space Telescope scientists have discovered a very large amount of cosmic material and yet they have not discovered any life on any other planet. Para. 5 1. the late astronomer . in our galaxy alone. By “technological civilizations”,the author may mean civilizations with high technology.Carl Sagan,the astronomer who is now dead,predicted that there are a million societies with advanced technology in our galaxy,without taking into account other galaxies