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Everyonehasseenplantsgrowing,buthaveyoueverthought61. ...
问题详情:Everyonehasseenplantsgrowing,buthaveyoueverthought61. theygettheirfood?Intheseventeenthcentury,62 EuropeanscientistcalledVanHelmotaskedthisquestion.Likemostpeople...