一个很奇怪的同位语的用法

jackiexucd

There are no legal limits, as there are for cod and haddock, on the size of monkfish that can be caught, a circumstance that contributes to their depletion through overfishing.

划线部分为全部句子。答案就是原文。

想问问这个circumstance是同位语吗？怎么那么奇怪呢？

来源：新东方语法教程section 10/3。大全上没找到这题

wei_wangyan

应该是概括性同位语:用一个概括性的名词去概括前面的修饰对象:短语/句子,a program/information/an effort/a practice that...等。

a circumstance概括前面的no legal limits。看一下OG的三个例子：

OG-38

Scientists have observed large concentrations of
                    heavy-metal deposits in the upper twenty centimeters of Baltic Sea sediments, which are consistent with the growth of industrial activity there.

Answer: sediments from the Baltic Sea, findings consistent
                    with the growth of industrial activity in the
                    area

findings provides a noun for consistent to modify.

OG-144

Efforts to equalize the funds available to school districts, a major goal of education reformers and many states in the 1970's, has not significantly reduced the gaps existing between the richest and poorest districts.

Answer: have not significantly reduced the gap that
                    exists

OG-167

Neanderthals had a vocal tract that resembled those of the apes and so were probably without language, a shortcoming that may explain why they were supplanted by our own species.

Answer: Neanderthals had a vocal tract resembling an ape's

qiuzhen28

这就叫如火纯金的境界读OG