地球引力

Wind,earth movements or tremors,and the gravitational pull of the moon and the sun.

风，地球的运动或震颤和月亮，太阳的引力。

Precise measurement of the Newtonian gravitational constant G plays important roles in the fields of the gravitation, geophysics, astrophysics, and cosmology. A torsion balance with timeof-swing method to determine the gravitational constant G is proposed.

Torsion balance ；万有引力常数G的精确测量不仅对于弄清引力相互作用的性质非常重要，而且对于整个理论物理学、地球物理学、天文学和宇宙学等都具有重要意义。

Earth's surface because the gravity of the water thus gathered.

因为这些引力地球表面的海水因而聚集。

Then, over hundreds of millions of years, volcanic eruptions returned the gases to Earth's surface, where gravity kept them from drifting off into space.

后来在几亿年的时间里，火山爆发使气体返回到地球表面，地表引力阻止了气体飘向太空。

The gentle pull of an exoplanet as it orbits the host star introduces a tiny wobble in the star's motion — only about 7 km/hour,corresponding to brisk walking speed — that can just be detected on Earth with today's most sophisticated technology.

系外行星在轨道上对宿主恒星的引力是如此&温柔&，对其运动产生的扰动仅有7km/h——相当于我们快步走的速度，今天刚好能被地球上最尖端光谱仪探测到。

Another method, called microlensing--in which a planet's gravity momentarily brightens a background star by bending its passing light--is particularly good for detecting planets more distant from their stars and in principle could spot lightweights with masses down to that of Earth.

另一种方法即所谓的透镜--其中一颗行星的引力通过弯曲经过的光线瞬间增亮背后的恒星—-对于探测距离恒星更遥远的行星是特别好的，并且在原则上可以透过降落到地球上的物质发现轻量级的行星。

Gravity pulled these planetesimals together, and the young Earth grew slowly, like a snowball, as more and more pieces collided with it.

重心引力将这些星子结合在一起。年轻的地球生长缓慢，如一个大雪球，愈来愈多的星子向它碰撞来。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。