The earth

People used to think the earth was flat .

人们曾经认为地球是平的。

Water covers a large proportion of the earth 's surface .

水覆盖了地球表面的大部分。

People used to believe the earth was flat .

人们一度认为地球是平的。

A new satellite has been put into orbit around the earth .

一颗新的人造卫星被送上了环绕地球的轨道。

The earth takes a year to make a circuit of the sun .

地球绕太阳运行一周需要一年的时间。

The earth takes a year to orbit the sun .

地球绕太阳一周要一年的时间。

The earth is almost 25 000 miles in circumference .

地球的周长大约为25000英里。

Mars takes longer to revolve on its axis than the earth .

火星自转一周的时间比地球长。

The earth moves round the sun .

地球围绕太阳旋转。

After a week at sea , it was good to feel the earth beneath our feet again .

出海一周后，重新踏上陆地感到很愉快。

When did mammals appear on the earth ?

地球上的哺乳动物起源于何时？

Ozone is the earth 's barrier against ultra-violet radiation .

臭氧是地球防止紫外线辐射的屏障。

The earth is illuminated by the sun .

太阳照亮地球。

The earth revolves around the sun .

地球绕太阳公转。

The earth revolves around the sun .

地球绕着太阳转。

Spacecraft which are re-entering the earth 's atmosphere are affected by g forces .

重返大气层的航天器受到重力的作用。

The earth revolves on its axis .

地球环绕自身的轴心转动。

They banked the earth into a mound .

他们把土堆成一个土丘。

The Earth is made mainly of iron and silicon and things like that

地球主要由铁、硅等物质构成。

When a large object impacts the Earth , it makes a crater .

当巨大物体撞击地球时，就会产生凹坑。

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。

The earth wire was not connected .

地线没有接上。

There is an asteroid on a collision course with the Earth .

有一颗小行星可能会与地球发生碰撞。

Ozone forms a protective layer between 12 and 30 miles above the Earth 's surface .

臭氧在地球表面上方12到30英里处形成一个保护层。

Weather satellites have observed a ring of volcanic ash girdling the earth

气象卫星观测到一个环绕地球的火山灰带。

The earth shook and the walls of neighbouring houses fell around them .

地面摇晃，周围房屋的墙体在他们身边倒塌。

Today we are overpopulated , straining the earth 's resources .

现在我们人口过多，致使地球资源使用过度。

Earthquakes leave scars in the earth 's crust .

地震会在地壳上留下裂痕。

She branched off down the earth track .

她改变路线，沿着土路走了下去。

The earth would be a frozen ball if it were not for the radiant heat of the sun

如果没有太阳辐射的热量，地球就会变成一个冰球。