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
Answer: sediments from the
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
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