是的,网友的句子是一个全部倒装句。这种倒装句是表语(主语补语)前置引起的全部倒装,多因尾焦(end-focus),尾重(end-weight),或二者兼而有之,而将主语置于句末,使之成为语义焦点,信息核心。所以,网友的句子把表语(主语补语)equally important前置于句首,句末的the mental aspect便成为了语义焦点,信息核心。
对于这种使主语成为信息核心的解释是有的。夸克等人的CGEL18.23有这样的解释:
… ln consequence,such fronting naturally carries with it the inversion that puts S in final position, and indeed it is to achieve end focus on the S that the fronting is generally undertaken:
CVS: Especially remarkable was her oval face. [1b]
CVS: Faint grew the sound of the bell. [2b]
AVS: ln a distant grave lies his beloved body. [3b]
此外,章振邦老师的《新编高级英语语法》46.4C特定情况下主语补语的前置也有说明(摘录部分内容):
主语补语的前置通常并不引起倒装,但在某种情况下也可能引起倒装,这有时是因为主语较长或结构较复杂。例如:
More serious was the question of how the President would present the joint announcement.
有时为了上下文衔接紧密而把主语补语移至句首。例如:
What Uncle Conroy did was important, but more important was the way he did things.
表语(主语补语)前置引起的全部倒装这一语法内容,在Longman Grammar of Spoken and Written English 11.2.2.2 Fronted predicatives一节有比较系统的阐述。感兴趣地话,可以阅读。
最后补充一下Bas Aarts对end-focus和end-weight的解释:
1. end-focus: A term used in CGEL to refer to the placing of the most important information in a sentence or clause (the focus) at the end.
2. end-weight: A term used in CGEL to refer to the tendency of longer (i.e. heavier) units of information to come at the end of a sentence or clause. Since new information may need more detailed explanation than given information, end-weight often goes hand-in-hand with end-focus.
以上内容,仅供参考。