The document also says "Iran continues to pose a significant challenge to Iraq's long-term stability and political independence.

VOA: standard.2009.03.31

So also, along those lines in terms of test taking, make sure you also box your answers and that you keep track of significant figures and that you also remember to include your units.

另外，既然提到了答题要求，我想提醒大家考试的时候务必标出自己的答案,保持有效数字的一致性,并且记得带上单位。

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But there are also some pretty significant things going on

但同时也有很多很重要的事情在发生，

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In two other cities, Los Angeles,California and Huntsville,Alabama, a study also showed significant differences in radiation.

VOA: standard.2010.01.30

The study also found that the age of the father can play a role, although it is not as significant as the age of the mother.

VOA: standard.2010.02.10

"Coping with these kind of impacts if you're dealing with significant affects on your agriculture or your water supplies, your infrastructure and also trying to develop new kinds of energy approaches, for example--that's going to take long term investment,"

VOA: standard.2009.12.11

So I think we need to devote the resources to try to be successful," The general says the U.S.and allied effort also needs to have a significant political and economic component, and that a strong,credible government must emerge from the current election process.

VOA: standard.2009.10.16