Question

下面这句英文句子中用了什么英语语法，求大神帮助

The most important fact in Washington's failure on Thursday to be re-elected for the first time since 1947
to the UN Human Rights Commission is that it was America's friends not its enemies that engineered its defeat.

Answer 1

句子是主系+表语从句结构，
The most important fact in Washington's failure is that (表语从句)

failure to be re-elected 当选失败

for the first time since 1947 自1947年以来首次（落选）

to be re-elected to the UN Human Rights Commission 当选联合国人权委员会

意思是，华盛顿自1947年以来第一次落选联合国人权委员会，(在这次失败中)最重要的是，是美国的盟友而不是敌人设计了这一幕。

Answer 2

平行结构。

追问

弱弱的问一句什么平行结构？