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请大家帮分析,这是什么句型?round、formsit代表什么?谢alternatively,ifthestarweresmall,thelife-supportingplanetwouldhavetohaveacloseorbitrounditandalsoprovidetheperfectconditionsforlifeformstodevelop

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请大家帮分析,这是什么句型?round、forms it 代表什么?谢
alternatively,if the star were small,the life-supporting planet would have to have a close orbit round it and also provide the perfect conditions for life forms to develop
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答案和解析
是if条件从句
round:环绕、围绕
forms :形态
it要根据上下文(context)来理解,估计指sun或者某颗星球
(因为没用上下文,这是我的理解)