专家们一致认为在未来几十年内将出现一个难题：如何在不破坏地球的情况下养活90亿人口。
Experts agree that the next few decades will present a puzzle: how to feed nine billion people without wrecking the planet in the process.
读者不仅看到史密斯的成长，而且得知了一系列未来地球的情况和人类社会所有的弱点。
The reader not only watches Smith's growth, but also gets a tour of a futuristic Earth and all the foibles of human society.
对于地表地球的情况，你们正在跟此时的许多地壳运动抗争，有时候是其带来的反弹比如海啸。
As for the outer earth circumstance, you are struggling with many earth movements at this time and sometimes the repercussions of this such as tsunamis.
克拉克并不认为研究人员会一直选这个方法在外太空搜寻生命，但他同意先了解地球的情况缩小了搜寻范围。
Clarke doesn't believe this report will drastically alter the strategy in the search for extraterrestrial life, but agrees that understanding Earth first Narrows the target.
根据研究生命起源的人们所作的工作，我们必然会得出这样的结论：如果设想有一颗行星和我们地球的情况基本相似，那几乎肯定会产生生命。
We must conclude from the work of those who have studied the origin of life, that given a planet only approximately like our own, life is almost certain to start.
让我们假设另一个星球的情况与地球上的相似。
Let us suppose another planet with conditions similar to those on the earth.
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。
The project would give scientists new insights into what is happening to the Earth's atmosphere.
有机农业是一种相对而言尚未开发的资源，可以用来养活地球上的人口，尤其是在应对气候变化和其他全球性挑战的情况下。
Organic agriculture is a relatively untapped resource for feeding the Earth's population, especially in the face of climate change and other global challenges.
在某些情况下，地下水位到达地球表面，在那里以河流、湖泊和沼泽的形式表现出来。
In some cases, the water table reaches Earth's surface, where it is expressed as rivers, lakes and marshes.
但是，反过来说，大多数帆船都配有马达，以便在港口内行驶，弗里德曼博士这样描述在地球轨道的情况。
But then again, most sailboats do have a motor for tooling around in the harbor, which is how Dr. Friedman describes being in Earth orbit.
在这样的情况下，地球大气层中稀有同位素所含的特征或许可以仿制常规火星甲烷所预计的特性。
In some circumstances, a feature caused by a rare isotope in the Earth's atmosphere might mimic the expected feature from normal methane on Mars.
除了那些物种走向灭绝的情况，地球把这类问题从肩上抖掉的能力被经常性的低估了。
Except in those cases in which a species is driven to extinction, the Earth's ability to shrug such things off is often underestimated.
要知道当时尤其是在没有望远镜的情况下，突然声称地球围绕太阳运动而非相反是多么巨大的飞跃。
It was a giant leap suddenly to argue that the Earth orbits the sun, rather than the other way around, particularly without telescopes.
与此同时，该卫星还通过研究恒星表面发生的星震来探测其内部情况，正如地质学家研究地震来了解地球的内部构造。
Thespacecraft is also probing the interiors of stars by studying starquakes ontheir surfaces—in much the same way that geologists learn about the Earth'sinterior by studying earthquakes.
这张地图展示了2010年八月期间地球大气层中的水蒸气分布情况。
This map shows the distribution of water vapor in Earth's atmosphere during August 2010.
但是，我们不能重新地球的历史，所以我们必须将如何演绎没有人为干预的情况。
But we can't rerun the planet's history, so we have to deduce what would have happened without human intervention.
即使检测到它，你要比较什么是真正的会发生什么事情，如果地球上已任其自生自灭的情况。
Even to detect it, you have to compare what is actually happening with what would have happened if the planet had been left to its own devices.
比如说土卫六探索号将会用到至少是原始的方法来研究同早期行星——地球出现生命时情况相似的地方。
The Titan explorer, for example, will be studying a place that - in a crude way, at least - resembles the early planet Earth at a time when life arose here.
如何才能避免出现电影"机器人总动员"描述的那种地球被一层固体垃圾屏障包围的情况？
What can we do to avoid a Wall-E scenario in which the Earth is surrounded by a solid barrier of junk?
理想的情况是这样的：在居住区内发现和地球组成结构类似的行星，并且围绕稳定的恒星公转。
The ideal discovery would be a planet similar in composition to Earth that lies within the Goldilocks Zone and orbits a stable star.
当这种情况发生的时候，本影无法到达地球，非本影阴影就会出现在地球表面。
When this happens, the umbra cannot reach Earth and an antumbra shadow is created over the planet's surface.
第二，它必需在不影响地球脆弱自然资源可持续性或者气候的情况下，促进满足将来全球对粮食和林产品的需要。
Second, it must foster the satisfaction of future global needs for food and forest products without compromising the sustainability of the earth's fragile natural resources or its climate.
斯帕是一条位于山区的开放式赛道，天气情况也变化莫测。仅仅这点就让这条建于1920年的赛道，获得地球上最具挑战性的赛道的称号。
Spa is wide open, hilly and bedeviled by treacherous weather conditions. That alone would make this track, built in 1920, among the most challenging on the planet.
哈里森说，即使很好的天气情况下，地球大气层的电场依然存在。电场可以使空气中传播的粒子以及云端边缘带电。
Even in fair weather, a very small electric field is present in Earth's atmosphere. This field can charge airborne particles and the edges of clouds, Harrison said.
在环境条件相同的情况下，造成天气复杂多变的主要因素，并不是到处存在的空气，也不是地球本身。
The main cause lies in this, that neither the air nor the earth is everywhere in the same condition.
地球和火星都必须在其确定的轨道运行，在这种情况下，发射窗只能每25各月才有机会发射一次。
Earth and Mars have to be at the right positions in their orbit for this method to work, and the launch window only comes around once every 25 months.
理想情况下，希望挽救地球的政客们都应该对其选民开诚布公，表明征税行为带来的代价。
Ideally, politicians who want to save the planet would be honest with voters about how much this will cost.
该组织提倡企业使用一种与环境有关的会计工具帮助其对地球自然资源的使用情况做出评估和预算。
It advocates an environmental accounting tool that can help businesses measure and budget their use of the Earth's natural resources.
“大多数情况下，我们对生命下的定义更像是对地球上已知生命形式所具有特性的总结。”莱特纳说。
"When we try to find a definition for life, in most cases, such a definition is more a summary of the specific properties of terrestrial life," Leitner said.
“大多数情况下，我们对生命下的定义更像是对地球上已知生命形式所具有特性的总结。”莱特纳说。
"When we try to find a definition for life, in most cases, such a definition is more a summary of the specific properties of terrestrial life," Leitner said.
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