Being two fundamental concepts of Stmcturalism, "endocentric structure" and "exocentric structure" were first proposed by Bloomfield, later improved by Hockett.

作为美国结构主义语言学理论的两个基础概念，“向心结构”和“离心结构”首先由布龙·菲尔德提出，后由霍凯特加以改进。

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Later researchers amused a lot of controversy about the distinction of "endocentric structure" and "exocentric structure" due to their inherent limitation of definition.

但向心结构和离心结构的理论区分因先天不足，后来的语言研究者对此区分提出了很多争议。

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Later researchers amused a lot of controversy about the distinction of "endocentric structure" and "exocentric structure" due to their inherent limitation of definition.

但向心结构和离心结构的理论区分因先天不足，后来的语言研究者对此区分提出了很多争议。

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