托福阅读原文及翻译托福阅读原文:,althoughjust4oftheseelements—oxygen,carbon,hydrogen,andnitrogen—,,(andatraceamountoflithium),,(bymass)ofoursolarsystem,,whichformedbeforemanyheavyelementswereproduced,theheavy-,,esimals—small,s—condensewithinaformingstarsystem,,esimalseverywhereshouldcontaintheelementsneededforlife,esimals—s,moons,asteroids,ets--systemformationexplainswhyEarthcontainsalltheelementsneededforlife,anditiswhyweexpecttheseelementstobepresentonotherworldsthroughoutoursolarsystem,galaxy,,ev
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