The moon is a satellite of earth.

月球是地球的卫星。

《牛津词典》

The moon exerts a force on the earth.

月球对地球有引力。

《牛津词典》

The earth takes a year to orbit the sun.

地球绕太阳一周要一年的时间。

《牛津词典》

Back then,there was much hope that humans would return soon and make a home on Earth's only natural satellite.

VOA: special.2010.04.28

And the reward for the poet's sacrifice here on earth is not simply eternal fame that had long been a privileged image.

诗人在世上的牺牲所带来的回报,不单是长久以来那个特权印象：百世流芳。

耶鲁公开课 - 弥尔顿课程节选

That is the lowest point on the earth's land surface so this dramatic drop in just a very short geographical area.

这是地球陆地表面的最低点,这急剧下降是在很短的地理范围内。

耶鲁公开课 - 旧约导论课程节选

Binzel recently created a 10-point scale for estimating the threat of a near-Earth asteroid, with zero indicating no chance of an Earth impact and 10 indicating a certain Earth impact with severe, global damage.

CNN: Scientists reduce odds of Earth-asteroid collision

If there is demand for houses, there will be demand for copper, and the copper miner will buy a new earth mover and employ a driver to run it.

FORBES: Dumb Idea: Investment Creates Jobs

From director Michael Bay and executive producer Steven Spielberg, in association with Hasbro, Transformers: Dark of the Moon explodes with high-octane action when a mysterious event from Earth's past erupts into the present day threatening to bring a war to Earth so big that the TRANSFORMERS alone will not be able to save us.

ENGADGET: Transformers: Dark of the Moon Blu-ray due September 30th, 3D version later