1.This is as a result of extreme weather conditions and also to be frank of a bad call on Saturday by the airport operator who was, as it turned out, over-optimistic about their ability to keep the airport open.

to be frank坦率地说,老实说

例句：To be frank, the question is not open to discussion. 
      坦率地讲，主权问题不是一个可以讨论的问题。

turn out结果是, 原来是

例句：He said he was a doctor; but later he turned out to be a cheat.
      他自称是个医生, 结果证明他是个骗子。

2.As of April 1, 2010, according to the 2010 Census, the resident U.S. population is 308,745,538.

as of在…时,到…时为止

例句：As of tomorrow, I am responsible for this group.
       从明天开始，我将对这个团体负责。
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