The fighting died down at the end of the day, and Jackson's men moved back to their positions on higher ground.

VOA: special.2009.09.24

It's a material force that his rhetoric challenges and relies on, gives him a means of getting off the ground, and a means of always getting back to it, too.

这是他的修辞所挑战的并且依赖的物质力量，这种力量给他离开地面的方法，也给他回到地面的方法。

耶鲁公开课 - 现代诗歌课程节选

Today,VOA broadcasts to satellites in space that send the signal back to stations on the ground that transmit programs with a clear signal.

VOA: special.2010.12.08

Back on the ground, the observations are sent to a task force tracking the spill.

VOA: standard.2010.07.05