Although the origins are uncertain, experts think that this is largely due to the high level of volcanic activity in the area.

尽管起源还不确定，专家认为这主要是由该地区频繁的火山喷发所造成的。

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Such courses, Hacker argues, are a remedy for the numerical illiteracy of adults who have completed high-level math like algebra but are unable to calculate the price of, say, a carpet by area.

哈克认为，这样的课程可以弥补成年人在数字方面的盲点，这些人虽然已经学习了像代数这样的高等数学，但却无法按面积计算出一块地毯的价格。

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If a user racks up enough of these titles in a specific neighborhood, he'll become the baron of that area, or the king at the city level.

如果一个用户在一个特定的地区得到了足够的这些头衔，他就将成为这个区域的男爵，或者是城市级别的国王。

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Still,this would only mean that there are community-level outbreaks in at least one other country in a different area of the world.

VOA: special.2009.05.06

And that is the highest point in Israel, it rises about 10,000 feet above sea level. The central mountain area, those are between 4000 and 10,000 feet above sea level.

那是以色列的最高点，它大约在海平面以上10000英尺，中央的山区，大约在海平面以上4000到10000英尺之间。

耶鲁公开课 - 旧约导论课程节选

But,unemployment rates in the Washington area are at their highest level in more than ten years.

VOA: special.2009.04.03

In a frantic period midway through the second half five goals were scored in 26 minutes, and Rapinoe hit a stunning half volley from the corner of the penalty area to level the match at 2-2 with 20 minutes to go.

CNN: STORY HIGHLIGHTS

An independent Scotland will have the opportunity to streamline the number of regulatory bodies in this area to a level more appropriate for its size.

BBC: Scotland politics

Some of the hotel's pool level area, where restaurants Circa 55 and Trader Vic's Lounge are located, have retained the original 1950s "Mad Men"-style color schemes.

CNN: 9 glamorous movie-star hotels