Sea-ice extent in August was also extremely low, second only to August 2007 (Fig. 1).

八月份的海冰范围也非常小，仅高于2007年八月的水平。

youdao

They show Arctic sea ice extent for the September 2009 minimum (left) and March 2010 maximum (right).

它显示的是北极海洋结冰程度在2009年9月的最低值(左)和2010年3月的最高值(右)。

youdao

The Arctic sea ice extent averaged for July was the second lowest in the satellite record, after 2007.

根据来自国家冰雪数据中心(NSIDC)的最新数字，7月份平均北极海冰面积为2007年后卫星纪录中第2个最低点。

youdao

The scientists say the average Arctic sea ice extent last month was about five million square kilometers.

VOA: special.2009.10.27

September is the month when the sea ice extent is at its lowest.

VOA: special.2009.10.27

The total of sea ice is known as the sea ice extent.

VOA: special.2009.10.27

Average monthly Arctic sea ice extent data shows a clear deceasing trend since 1979.

UNESCO: Social and Human Sciences

The extent of Arctic sea ice extent fell to 4.10 million square kilometers on August 26, 2012.

FORBES: As Arctic Ice Reaches Record Low, Meteorologists Name Humans 'Dominant' Cause Of Climate Change

Based on predictions of sea ice extent from climate change models, the penguins are likely to see their numbers plummet by 95% by 2100.

BBC: Emperor penguins face extinction