地球的力量

In Earth's formative years,it was hit by thousands of comets like this.
在地球形成的时代 它要受到成千上万个这样的彗星撞击
By the time the bombardment finished,
一旦撞击完成
it's thought they'd delivered up to half the water in our oceans.
据分析它们会将一半的水释放到我们的海洋

The amount of water in the oceans has stayed roughly the same
自从40亿年前海洋形成开始
ever since they were formed about four billion years ago.
海洋中的水量差不多一直没变
But the oceans themselves are continually changing.
但是海洋本身不断变化着
As the continents move over millions of years,
随着大陆移动了几百万年
new oceans open up, whilst others vanish.
新的海洋会出现，有的会消失
It's hard for us to grasp because it happens over such an immense timescale.
我们很难理解 因为这些都发生在很长的时间跨度里
Vet today, in East Africa we can actually see the possible beginnings of a new ocean.
但是今天在东非 我们能看到新海洋的诞生
This long, deep fissure,
这个漫长深邃的裂缝
in an area of Ethiopia called the Afar Depression,
位于埃塞俄比亚一个叫阿法尔洼地的地方
is where the planet's next ocean may form.
这里将是地球下一个海洋形成之地
It appeared in 2005,when the Land was suddenly ripped open by a massive earthquake.
2005年出现的 陆地突然被一次巨大的地震裂开了口子
Nearby, similar tears and fractures
附近也有类似的裂缝和断层
scar the desert for many miles.
连绵沙漠几百公里
This is the Earth's crust splitting apart.
这是一个被分裂的大陆

重点讲解

1、deliver
递送;投递;运送
The Canadians plan to deliver more food to southern Somalia.
加拿大计划向索马里南部地区运送更多的食品。
The spy returned to deliver a second batch of classified documents.
那名间谍返回来递送第二批机密文件。
履行;兑现;实现
They have yet to show that they can really deliver working technologies.
他们尚未证明自己真的能够开发出实用技术。
proving they could deliver the vote in their areas...
证明他们能够得到自己选区的选票
托付;交托
Mrs Montgomery was delivered into Mr Hinchcliffe's care.
蒙哥马利夫人托给了欣奇利夫先生照顾。
David delivered Holly gratefully into the woman's outstretched arms.
戴维非常感激地把霍利送进那个女人张开的双臂中。
2、continual
不停的;不间断的
The school has been in continual use since 1883.
自1883年以来，该校从未停办过。
They felt continual pressure to perform well.
他们不断感受到压力，促使他们好好表演。
一再的;反复的;频繁的
the government's continual demands for cash to finance its chronic deficit.
政府为补贴长期的财政赤字而对资金的持续需求
She suffered continual police harassment.
她不断受到警方的骚扰。