【正确答案】正确答案：An endocentric construction is one whose distribution is functionally equivalent, or approaching equivalence, to that of one or more of its constituents, i. e. a word or a group of words, which serves as a definable center, or head. Hence an endocentric construction is also known as a headed construction. Noun phrases like Lovely Lucy are typical endocentric constructions. Opposite of endocentric constructions, the exocentric construction refers to a group of syntactically related words where none of the words is functionally equivalent to the group as a whole. There is no noticeable centre, or head in it. Prepositional phrases like "on the shelf" are typical examples of this type.