CNN news 2010-05-25 加文本

1.Most of the board members are conservative and they're on the verge of changing social studies teaching standards in Texas.

on the verge of接近于,濒临于

例句：Some animals are on the verge of extinction.
      有些动物已濒临绝种。

2.People pushing for the new curriculum say it will dwell more on the positive in America and less on the negative.

dwell on细想,详述,强调

例句：You should not dwell too much on your past failures.
      你不应该老是想着过去的失败。

      No need to dwell on the sumptuousness of that feast.
      更不用再说那肴馔之盛。

3.And yes, when it comes to the Civil War, discussions about states' rights.

when it comes to一谈到……；当说到……；当涉及到……

例句：He's no slouch when it comes to writing books.
      要说到写书他可是行家里手。

4.Your actions have produced a series of curriculum standards which undermine the importance of multiculturalism and respect for alternative viewpoints, foundations upon which America's society and democracy have been built.

which undermine是定语从句，修饰的是curriculum standards，undermine的宾语是三个并列的词语：importance，respect和foundations。