地球的力量

We see this process in action when particles no larger than grains of sand
我们看到的实景 就是晚上的时候
burn up as they streak across the night sky.Shooting stars.
有像沙粒一样大的亮光一闪而过 流星雨

One object that didn't burn up was Theia, Earth's twin.
地球早期和自己孪生星球的撞击
Earth's early collision with its twinwas also vital for our planet in many other ways.
在其它方面也很重要
For a start, it probably resulted in Earth's core becoming larger.
一开始，地核变大
And because it's made of iron,
因为它是由铁组成的
the churning of this huge metal core generates a powerful magnetic field.
这个巨大的金属地核就产生了 巨大的磁场
It's possible to see this magnetic field at work.This is the aurora.
我们可以看到磁场如何发挥作用 这是极光
You're watching the magnetic field deflecting
你现在看到的就是地球磁场
the Sun's dangerous solar wind.
将太阳危险的太阳风扭曲
But the huge molten core contributes something else
但是这个巨大的融化内核
essential for life on Earth,
对地球生命还起到其它作用
a way of helping to regulate the planet's temperature.
这是调节地球温度的一种方式
It's a remarkable system.
这是一个很了不起的系统

重点讲解

1、burn up
烧毁；烧光
The satellite re-entered the atmosphere and burned up.
卫星重新进入大气层，烧成灰烬。
Fires have burned up 180,000 acres of timber.
大火烧光了18万英亩的木材。
消耗；耗费
Brisk walking burns up more calories than slow jogging.
快走比慢跑能消耗更多的热量。
2、contribute
(为…)做贡献
The three sons also contribute to the family business.
这3个儿子也为家族事业做出了贡献。
I believe that each of us can contribute to the future of the world.
我相信我们每一个人都能够对世界的未来有所贡献。
捐献;捐助;援助
The US is contributing $4 billion in loans, credits and grants.
美国将提供40亿美元的信贷和赠款。
They say they would like to contribute more to charity, but money is tight this year.
他们说他们很想捐献更多的钱支持慈善事业，但是今年的钱非常紧张。
促成;促使；是导致…的原因之一
The report says design faults in both the vessels contributed to the tragedy.
报告说两艘船存在的设计缺陷也促成了这场悲剧的发生。
Stress, both human and mechanical, may also be a contributing factor.
来自人的和机械方面的压力可能也是一个因素。