Ash up to three hundred meters thick covered more than six hundred square kilometers around the volcano.

VOA: special.2010.07.05

Sometimes they give you the speed in miles per hour, kilometers per year, pounds per square foot.

有时候速度的单位是英里/小时,千米/年,英磅/平方米

耶鲁公开课 - 基础物理课程节选

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

VOA: special.2009.10.27

Texas has a land area of more than six hundred and seventy-eight thousand square kilometers.

VOA: special.2009.09.22

The study found an average ice cover of about fifteen million square kilometers in March.

VOA: special.2009.05.05

This was more than one million square kilometers more than the record low for September.

VOA: special.2009.10.27

This huge continent on the Earth's South Pole covers about fourteen million square kilometers.

VOA: special.2009.06.03

The agreement gave almost 18,000 square kilometers of the disputed area to Maine.

VOA: special.2009.02.05

It has a surface area of almost twenty thousand square kilometers.

VOA: special.2009.08.19

New York City is close to eight hundred square kilometers.

VOA: special.2009.03.20

It is only about one hundred fifty-five square kilometers.

VOA: special.2009.03.20

The largest fire has burned about 500 square kilometers of the Angeles National Forest, north of Los Angeles.

VOA: standard.2009.09.01

Canada's northernmost territories Yukon, Northwest Territories and Nunavut cover more than 3.5 million square kilometers.

VOA: standard.2010.02.19