I can understand why astronauts find it difficult to readjust to life on earth.

我能明白为什么宇航员们发现难以重新适应地球上的生活。

《柯林斯英汉双解大词典》

Life on Earth will become unsustainable unless population growth is held in check.

地球上的生命将无法延续，除非人口增长得到控制。

《柯林斯英汉双解大词典》

Is There Life on Earth?

地球上有生命吗？

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It uses objects from the museum's collection to show how Darwin helped us understand the history of life on Earth.

VOA: special.2009.12.01

There's a short story by the science fiction writer Orson Scott Card, where the basic point of the story is that of all the life forms in the universe, we, here on Earth, are the only ones that are mortal.

科幻作家Orson，Scott，Card写了一个短故事，该故事的主旨是,在宇宙的所有生命形式中，我们，在地球上是唯一终有一死的生命。

耶鲁公开课 - 死亡课程节选

He developed the theory of evolution that life on Earth developed through the process of natural selection.

VOA: special.2009.12.16

Microbes are the oldest form of life on earth and vital to life as we know it.

FORBES: A Better Database

Things that change our perception of our life on earth and our place in the universe.

FORBES: What Is It Like To Work At NASA?

Each mission will look for signs of water, a requirement for life on Earth.

CNN: Mars Express leads interplanetary pack