独立主格 A surplus

问题描述

A surplus allows snow to accumulate and for the pressure of snow accumulated over the years to transform buried snow into glacial ice with a depth great enough for the ice to flow.

请问” with a depth great enough for the ice to flow”应该理解为条件状语还是独立主格？

老师答疑

刘老师：

glacial ice with a depth great enough for the ice to flow：

1. with a depth great enough for the ice to flow不是独立主格，而是介词短语作定语，修饰glacial ice。

2. 在这个介词短语中，great enough for the ice to flow是形容词短语作定语，修饰a depth，相当于一个定语从句。补充完整为：glacial ice with a depth which is great enough for the ice to flow

意思：有足够深度可让冰块流动的冰川。