BBC news 2009-06-23 加文本

There’s been unrest on the streets before in the 30-year history of the Islamic Republic of Iran, but what makes this crisis uNPRecedented is that it’s in parallel with a fracture in the ruling elite.

参考翻译：此前，在伊斯兰共和国历史上也出现过大规模的动乱，但是这次危机却是空前的，因为危机与统治阶级的破裂并行。

语法讲解：what makes this crisis uNPRecedented是主语从句

在句中作主语的名词性从句称为主语从句， 主语从句所对应的谓语动词通常用第三人称单数的形式。为了整个句子的平衡， 主语从句经常后置， 并用it充当形式主语(此时， that引导的主语从句若不放在句首， 可以省略引导词that)。例如： What she did is not yet known. 她干了什么尚不清楚。// Whoever comes is welcome. 不论谁来都欢迎。// It is a pity (that) we haven’t contacted for ages. 很遗憾， 我们几年没联系了。// It has not been decided where the meeting is to be held. 在哪里开会还没决定。// It doesn’t matter whether she will come or not. 她是否来这无关紧要。

in parallel with与...平行, 与...同时, 与...并联

Negotiations for a peace went on in parallel with the war.
和平谈判与战争同时进行。

But as emergency crews continue to cut through the wreckage, it’s clear that dozens of people have been rescued.

参考翻译：但是紧急救助小组继续清除残骸的时候，很明显解救出了几十人。

语法讲解：it做形式主语

作为形式主语的it并无实际语义，只是为满足语法上的需要，避免句子头重脚轻，它代替 的是句子的逻辑主语，概括起来会有如下情况：
　　1. 句子的逻辑主语为不定式
　　如：It is very kind of you to give me a hand in time.
　　It is my pleasure to address the meeting.
　　It was pretty hard for him to bring up the child on his own.
　　2. 句子的逻辑主语为从句
　　如：It so happened that the tickets were sold out.
　　It is extremely obvious that she has been lying about her identity.
　　It suddenly occurred to me that the message must have been hidden
　　between the layers of the briefcase.
　　3. 句子的逻辑主语为动名词短语
　　这类句子远不如前面两种出现率高，主要在（no good, waste, useless, no use,
　　dangerous）等词语的后面用
　　如：It is no use reasoning with him.
　　It is no good reading in dim light.