地球上

The parameters within which life can be sustained on Earth are extraordinarily narrow.

地球上生命可以存活下来的地域范围是非常狭小的。

Many types of animal have now vanished from the earth.

许多动物物种现已从地球上绝迹.

The total number of species on the planet appears to be growing by leaps and bounds.

地球上的物种数目似乎正飞速增长。

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

我能够理解为什么宇航员发现重新适应地球上的生活不容易。

Scientists have described the Aral sea as the site of the worst ecological disaster on earth.

科学家把咸海描述成地球上最严重的生态灾难发生地。

Eons passed before life existed on the earth.

经过数不清的年代以后,地球上才有人类.

the origins of life on earth

地球上生命的起源

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

人口增长要是不加控制的话，地球上的生命将无法持续发展。

The number of wild animals on the earth is dwindling.

地球上野生动物的数量正日渐减少.

The Pacific Ocean is the biggest ocean in the earth.

太平洋是地球上最大的海洋.

The drag of those extra air molecules brought the satellite crashing to Earth.

额外的空气分子阻力使得卫星坠毁到了地球上。

Roll up, roll up, come and join The Greatest Show on Earth.

快来呀，快来呀，来一起看“地球上最精彩的演出”。

Camels are among the most physiologically resilient creatures on Earth.

骆驼是地球上生理适应能力最强的生物之一。

The blue whale is the largest living thing on the planet.

蓝鲸是地球上体型最大的生物。

Some pulsars keep time better than the earth's most accurate clocks.

某些脉冲星发送脉冲比地球上最精确的时钟都准时。