Between thirty and thirty-five women used each system to pump water from the ground or a stream.

VOA: special.2010.01.11

So, if we're talking about five different orbitals and we're talking about a ground state atom, we know that we just need to start at the bottom and work our way out up.

因此，如果我们要讨论的是,五个不同的轨道且是属于一个基态原子的话，我们知道，我们只需要从最低的轨道,开始一个一个往上找。

麻省理工公开课 - 化学原理课程节选

The deepest part of the mine is nearly two thousand five hundred meters below ground.

VOA: special.2009.07.21

"Despite more than two million troops in uniform - not counting the US military - NATO has struggled,at times desperately, to sustain a deployment of twenty-five thousand to forty-five thousand troops, not just in boots on the ground, but in crucial support assets."

VOA: special.2011.06.11

For five days, through one crisis after another, the Apollo 13 crew and mission specialists on the ground worked through each difficulty.

VOA: standard.2010.04.04