Earth gravity mechanism for plate motion is investigated primarily.

初步探讨了板块运动的地球重力学机制。

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The main purpose of physical geodesy is to ascertain the outer Earth gravity field and geoid.

物理大地测量的主要目标是确定地球外部重力场和大地水准面。

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Arrows would continue to fly forward forever in a straight line were it not for gravity, which brings them down to earth.

要不是重力使箭掉落地上，它将会一直沿直线往前飞行。

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Newton proved his idea by measuring how much gravity force would be needed to keep the moon orbiting the Earth.

VOA: special.2011.06.01

But gravity has a remarkable property that the pull of the Earth is itself proportional to the inertia of the object.

重力有一个显著特征,即地球的引力,与物体的质量成比例

耶鲁公开课 - 基础物理课程节选

The poet, after all, is subject to gravity in Frost, to the force of the earth.

这个诗人，弗罗斯特，终究还是受制于地心引力，受制于地球的力量。

耶鲁公开课 - 现代诗歌课程节选

Even here on Earth, gravity has a greater pull in some spots than in others.

FORBES: NASA Prepares To Crash Its Probes Into The Moon

The returning Alpha crewmembers, meanwhile, are doubling up on exercise sessions to prepare for their return to Earth's gravity.

CNN: Space station handover ceremony delayed

Lifting heavy spacecraft and fuel out of the Earth's gravity is expensive.

CNN: Bush: 'It is time for America to take the next steps' in space