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

水覆盖了地球表面的大部分。

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。

Part of Earth's beauty comes from its oceans.

地球的一部分美来源于海洋。

We call this Earth's radiation budget.

我们称之为地球的辐射预算。

We can draw the earth's orbit round the sun.

我们可以画出地球绕太阳运行的轨迹。

At the same time, these clouds trap in some of Earth's heat.

与此同时，这些云吸收了一些地球的热量。

Periodic changes in Earth's orbit could affect Earth's climate.

地球轨道的周期性变化会影响地球的气候。

It is to get the rocket going fast enough to escape Earth's gravity.

是为了让火箭的速度足够快，足以逃离地球的引力。

In short, Venus seems to justify its long-held nickname of earth's twin.

简而言之，金星似乎证明了它长期以来被称为地球双生子的合理性。

We've already talked about how that affects earth's overall temperature.

我们已经讨论过它是如何影响地球的整体温度。

Precession, basically is the change in the direction of earth's axis of rotation.

岁差，基本上是地球自转轴方向的改变。

Earthquakes leave scars in the Earth's crust.

地震会在地壳上留下痕迹。

The sun is constantly evaporating the earth's moisture.

太阳使地球上的湿气不断蒸发。

The spacecraft burned up as it entered the earth's atmosphere.

宇宙飞船进入地球大气层时被烧毁。

The station would burn up on reentry into the Earth's atmosphere.

该操作台会在重新进入地球大气层时烧掉。

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

有些脉冲星表比地球上最精确的时钟还准。

The shuttle Columbia will re-enter Earth's atmosphere tomorrow morning.

哥伦比亚号航天飞机将在明天上午重进地球大气层。

There is little doubt that man has had an impact on the Earth's climate.

毫无疑问人类对地球上的气候造成了影响。

The timeline shows important events from the Earth's creation to the present day.

该年表列出了从地球诞生迄今的重要事件。

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

臭氧在距地球表面12至30英里的地方形成一个保护层。

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 force of friction slows the spacecraft down as it re-enters the earth's atmosphere.

航天飞机重返地球大气层时因有摩擦力而减慢速度。

If a spacecraft travels faster than 11 km a second, it escapes the Earth's gravitational pull.

如果一架宇宙飞船飞行超过每秒11公里，它就能摆脱地球引力。

The project would give scientists new insights into what is happening to the Earth's atmosphere.

该项目将使科学家们对地球大气层正在发生的情况有更新的了解。

We get creative at Earth's Friends!

我们在地球之友俱乐部创意满满！

More importantly, we can help protect the Earth's most valuable resources.

更重要的是，我们可以帮助保护地球上最宝贵的资源。

Nearly three quarters of the earth's surface is covered by water.

地球表面近四分之三被水覆盖。

It's blue because water covers almost three quarters of the Earth's surface.

它是蓝色的，因为水几乎覆盖了地球表面的四分之三。

The northern end of the earth's axis points towards the sun in summer.

在夏季，地轴的北端指向太阳。

Burn it in the earth's atmosphere.

在地球大气层中燃烧。