| 1. | Bearing functional reproductive structures such as seeds or fruit or material such as spores or pollen
具有生殖结构的如种子、果实或类似孢子或胚种等有结果或再生功能结构的 |
| 2. | Researchers plan to evaluate the likelihood of panspermia by studying whether microorganisms can survive an interplanetary journey
研究人员打算研究：微生物是否可以在星际旅行中存活，并据以评估胚种说存在的可能性。 |
| 3. | For this reason , the most commonly discussed panspermia scenario involves the transport of microbes or their precursors from mars to earth
基于这个理由，最常受人讨论的胚种说就是：微生物或其前驱物，是从火星送到地球的。 |
| 4. | The panspermia hypothesis posits that living cells or their precursors could have emerged on another planet or moon billions of years ago and hitched a ride to earth on a meteorite
“胚种假说”假设：活细胞或其前驱物可能于数十亿年前发源自其它行星或月球上，并且搭陨石的便车来到地球。 |
| 5. | For panspermia to occur , however , microorganisms need to survive not only ejection from the first planet and atmospheric entry to the second but the interplanetary voyage itself
然而，胚种说真要发生，微生物除了从第一颗行星喷发、进入第二颗行星的大气时必须幸存之外，还要能在整个行星际旅程中保住小命。 |
| 6. | The theory that microorganisms or biochemical compounds from outer space are responsible for originating life on earth and possibly in other parts of the universe where suitable atmospheric conditions exist
有生源说，胚种论一种学说，认为来自宇宙空间的微生物或生物化学物是地球上生命的起源，并且在宇宙的其他部分可能有适合的大气状况存在 |
| 7. | Because it is not possible at this time to quantify all the steps of the panspermia scenario , investigators cannot estimate how much biological material or how many living cells most likely arrived at earth ' s surface in a given period
由于当前无法量化胚种说情境中的所有步骤，研究人员无法估计某特定时期内，可能有多少生物体或活细胞抵达地球表面。 |
