We need therefore to
know how much the climate can vary of its own accord in order to interpret with
confidence the extent to which recent changes are natural as opposed to being
the result of human activities.
这里的 of its own accord 意思貌似是明白 可 不知道他的确切用法
这肯定是 介词短语作状语 可不知道这里的of 的用法是什么
希望给予回答 谢谢!
还有,
extent to which recent changes are natural as opposed to being
the result of human activities.
这部分 也希望 解释清楚, 特别是, as opposed to being 是什么结构,,,