主格人称代名词担任句子里面的主语或主语的补语。
Subjective personal pronouns act as subjects or subject complements in sentences.
你的房间有我的两倍大。 double作主语补语。
本句是并列句，前一个分句中，“if”引导条件状语从句，主句主语“it”指代“the tradition of ambition”。 后一个分句中“who”引导一个定语从句修饰“people”，“the educated not least among them”是“people”的补语。
If the tradition of ambition is to have vitality, it must be widely shared; and it especially must be highly regarded by people who are themselves admired, the educated not least among them。
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