21.Without ______ thorough understanding of great scientific achievementsWithout ______ thorough understanding of greatscientific achievements,you can’t have ____ say over their positive effects onour life.a;a 为什么?

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21.Without ______ thorough understanding of great scientific achievements
Without ______ thorough understanding of greatscientific achievements,you can’t have ____ say over their positive effects onour life.
a;a 为什么?

这是两个固定说法而已:
a thorough understanding of .透彻地理解.
have a say over sth 对.的发言权