Their study showed this "ground force" was around 9% lower in the prosthetic limb versus the unaffected leg.

他们的研究显示，义肢的“蹬地力量”比人腿小9%左右。

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The force threw little Bill out of the wagon and he landed on the sandy ground.

VOA: special.2009.11.28

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

If you look at the ground state in two different systems -If you look at the ground state which is n equals one, think about this, if I increase the proton charge, the Coulombic force of attraction is greater.

如果你观察两个不同系统的基态,当你观察n，等于1的基态时，试想一下，如果我增加质子电荷，相互吸引的库仑力就会更大。

麻省理工公开课 - 固态化学导论课程节选

With the aerial route denied to them Villa's ground force picked their way through the Stoke defence to score a delightful equaliser.

BBC: Stoke 3-2 Aston Villa

Already, the defense secretary has signaled that he is inclined to cancel the Marines' top ground force modernization program - the Expeditionary Fighting Vehicle (EFV).

CENTERFORSECURITYPOLICY: Send away the Marines?

Officials said the division's 3rd Squadron, 7th Cavalry encountered a large Iraqi ground force, but a sandstorm in the region prevented troops from calling in air cover.

CNN: Euphrates battle may be biggest so far