1·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。