Roots of Peace says a landmine costs anywhere from three to thirty dollars to produce and place in the ground.

VOA: special.2010.05.03

The plan now is to have about a thousand and nine hundred something civilian people on the ground in Afghnastan by New Years Day which is about three times of we had last year.

现在的计划是说我们将要派大概1900平民到阿富汗,在新年之前,这个数量是去年的三倍之多。

普林斯顿公开课 - 国际座谈会课程节选

In colder climates, parsley can go into the ground two to three weeks before the last winter freeze is likely to happen.

VOA: special.2009.06.02

Earlier this month, Michelle Obama and twenty-three schoolchildren helped prepare the ground for an organic vegetable garden on the South Lawn of the White House.

VOA: special.2009.03.31

Leave about two or three centimeters above the ground so the plant will re-grow.

VOA: special.2010.10.12

The Democrats met just three blocks from the White House, but with half a meter of snow on the ground from a winter storm, the trip became dangerous.

VOA: standard.2010.02.06