When we have both our feet firmly on the ground, and when we are down to earth we do not have our noses in the air.

VOA: special.2009.03.08

Then he flung outward, feet first, with a swish, Kicking his way down through the air to the ground.

然后，纵身一跳，他两脚先伸出去，在空中乱踢乱舞，于是飕的一声，降落到地面。

耶鲁公开课 - 现代诗歌课程节选

Warm air rising from below causes the wind tube to reach toward the ground.

VOA: special.2010.05.11

"What is electric mobility going to give us? Not only on the ground but in the air?

VOA: standard.2010.08.11

The B-1 is a strategic bomber that was not originally designed to provide direct air support to ground forces, which was the mission in this instance.

VOA: standard.2009.06.08