主旨:探讨地球上水的来源,是comets 还是asteroids
P1 引出问题 地球的水来自哪里
P2 提出两种来源(asteroid—found between orbits of mars and jupiter; comet—outer reach of solar system),并说明来源于comet
P3 通过A的团队发现,证明来源是asteroid
常用词:
Solve the conundrum 解决了这个谜题
Throw up the question
One big question that remains unanswered about the evolution of the early earth
Their presence being crucial to the origins of water and life
Take a significant step towards solving