月球对地球的吸引力引起潮汐。
地球的周长大约为25 000英里。
我们繁衍得如此之快，以至于人口数量威胁到地球的生态系统。
We are reproducing ourselves at such a rate that our numbers threaten the ecology of the planet.
我们已经讨论过它是如何影响地球的整体温度。
We've already talked about how that affects earth's overall temperature.
这一代人不是说他们关心自己的健康和地球的福祉吗？
And isn't this the generation who say they're concerned about their health and the well-being of the planet?
这一代人不是说他们关心自己的健康和地球的福祉吗？
Isn't this the generation who say they're concerned about their health and the well-being of the planet?
年复一年，消耗速度越来越快，超过了地球的生态承载力。
Year after year, faster and faster, consumption outpaces the biological capacity of our planet.
即使在没有冰川的时期，天文周期也会对地球的气候产生影响。
Astronomical cycles have an effect on Earth's climate even during periods when there is no glaciation.
地球的气候系统不断试图在云层的降温和变暖效应之间取得平衡。
Earth's climate system is constantly trying to strike a balance between the cooling and warming effects of clouds.
经济学家担心，在未来100到150年内，地球的资源将变得非常稀缺。
Economists fear that within the next 100 to 150 years, the earth's resources will become very scarce.
尽管地球的水资源丰富，但由于海水不能直接被利用，所以仍有许多地方缺水。
Even though our earth is rich in water resource, there is still a shortage of water in many places because ocean water can't be used directly.
为了使地球保持恒定的平均温度，来自地球的这种辐射必须平衡入射的太阳辐射。
For the Earth to maintain a constant average temperature, such emissions from the planet must balance incoming solar radiation.
这位科学家研制出一个模型，能模拟全年地球的气候。
The scientist developed one model to simulate a full year of the globe's climate.
“绿色生活”旨在承担保护地球的责任。
"Living green" is to take responsibility for protecting the earth.
它大约是地球的一半大小。
我想挖一个贯穿地球的洞。
孩子们喜欢在户外学习有关地球的知识。
其中一个问题可能是返回地球的方法。
水不仅仅是地球的重要组成部分。
地球的一部分美来源于海洋。
它跨过了地球的四分之一。
我不确定即使地球的温度得到控制，冰川是否能再生。
I'm not sure whether the glaciers can regrow even if the planet's temperature is controlled.
我没有把注意力放在叮咬上，而是阅读了蚂蚁对地球的帮助。
I didn't focus on bites, but instead I read about how helpful ants are to the planet.
来自世界各地的成千上万的人前往大会，讨论地球的明天。
Thousands of people from around the world headed for it to talk about the Earth's tomorrow.
鹊桥卫星将在地球的控制器和月球背面之间形成一座通信桥梁。
The Queqiao satellite will form a communication bridge between controllers on Earth and the far side of the Moon.
其旨在创造一个更公平、更环保的世界，并作出保护地球的承诺。
It aims to create a fairer, more environmental world and make promises that will help the planet.
世界上有一半种类的动物、植物和昆虫生活在地球的热带雨林中。
One half of the world's species of animals, plants and insects live in the Earth's rainforests.
很高兴见到你，第一个已知的穿越银河系来到地球的旅行者。
It's a pleasure to meet you, the first-known trans-galactic visitor to Earth.
第一集就是真正的第一集，讲述了地球的毁灭。
The first episode is the real first episode, which tells about the destruction of the earth.
安吉尔认为，这将使到达地球的光量减少2%。
This could, argues Angel, reduce the amount of light reaching the Earth by two per cent.
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