较常使用。在柯林斯辞典中， tertiary 是1万个最常用词之一。
英式英语: tertiary ADJECTIVE
Tertiary means third in order, third in importance, or at a third stage of development.
He must have come to know those philosophers through secondary or tertiary sources.
tertiary 的定义—— 柯林斯 英语词典
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