To begin with, they will have to find out whether life has ever existed on the planet of Mars in the past.
首先，他们必须搞清楚火星上是否曾经存在过生命。
If the young Sun was much fainter and cooler than the Sun today, liquid water couldn't have existed on either planet.
如果早期的太阳比现在的太阳暗淡，也没有现在这么炙热的话，那么液态水就不可能在这两个星球上存在。
Even setting aside the unproven hints of ancient oceans, the extent of the outflow channels suggests that a huge total volume of water existed on Mars in the past.
即使不考虑未经证实的古代海洋迹象，流出渠道的范围表明，过去火星上存在着大量的水资源。
我们靠吃大米过活。
Different types of bacteria existed on public-toilet floors.
公共厕所的地板上有不同类型的细菌。
What little scholarship has existed on Ernest Hemingway—considering his stature—has focused on trying to unmask the man behind the bravura.
考虑到欧内斯特·海明威的地位，关于他的少量研究都集中在试图揭开他虚张声势的面具上。
However, more recent data imply that at least some parts of the planet did in fact experience long periods in the past during which liquid water existed on the surface.
然而，更新的数据表明，至少在该星球表面的一些部分的确存在过液态水，且存在于过去很长的一段时间内。
Prior to 1960, geologists Bowen and Hess disagreed over whether or not the very high temperatures needed to produce magmas rich in magnesium could have existed on Earth.
在1960年之前，地质学家鲍温和赫斯在地球上是否存在产生富含镁的岩浆所需的高温这一问题上存在分歧。
Malone knew that hundreds of books existed on Rennes.
马龙知道关于里奈已经有了几百本书。
Dinosaurs existed on Earth more than sixty million years ago.
六千多万年以前，地球上就存在恐龙。
We are fortunate to live in the richest era that ever existed on the face of the earth.
我们很幸运，生活在地球史上最富裕的时代。
The results showed that structural hydroxyls existed on FS and some of those were active.
结果表明，FS存在结构羟基，其中一些羟基具有化学反应活性。
Typical stoma clusters were existed on the lower epidermis of the middle part of grape leaves.
叶片中部下表皮存在典型的由气孔及其周围体形较小的气孔形成的气孔群。
Holabird was skeptical that more in-depth studies would show that much gold existed on the land.
霍拉·伯德被怀疑更深入的研究将表明，多的黄金土地上的存在。
These details of service are not only being existed on the surface, but being implemented stably.
而这些细节的服务不单单是表面的，更应该每次都落在实处。
NASA's Mars detector, Opportunity, succeeded in finding signs that water once existed on the planet.
美国国家航空航天局的“机遇号”火星探测器于一月份在火星上着陆。
Makeshift encampments of people who don't have permanent homes have long existed on the margins of many U.S. cities.
那些没有永久住房的人们的临时聚集地在美国的很多城市中始终存在。
Yes, we're talking about the utter collapse of the entire basis by which every society has ever existed on the planet.
没错，这儿说的正是每个存在在这星球上的社会中，最基本的东西的崩塌。
Imagine using Mars as a stopover point for water and refueling. As for determining whether life ever existed on Mars.
想象一下，火星可以作为一个补给水和燃料的中转站，同时判断一下火星上是否有生命存在。
Mr. Batra said he had asked a lawyer for Facebook if the picture still existed on a server or was stored somewhere else.
巴楚说，他曾询问Facebook的一名律师，这些照片是否还存在于他们服务器或别的账户。
Much of the $50 billion that he has confessed to losing was phantom profit that only existed on customers’ account statements.
麦道夫供认已经损失的500亿美元仅仅存在于客户帐户报表上了。
Our results showed that most of the performance problems existed on Server 1, which then affected the performance of the cluster.
我们的结果表明大部分性能问题出现在服务器1上，然后影响到整个集群的性能。
For example there is vast and undeniable proof that life has not only existed on your Moon and Mars, but still does to this day.
举个例子，这里有着大量的不可否认的证据，那就是生命已经不仅仅只存在于你们的月球和火星上，但是却一直拖延至今。
Life could have existed on another planet, maybe even one as close as Mars, and then made its way to Earth instead of originating here.
生命可能起初存在于另一颗行星，也许就是离得最近的火星，而后通过某种途径来到了地球，而非起源于此。
The mineral comes from the fossilised remains shells and bones and provides a way to investigate the ancient life that existed on early Earth.
来自化石的矿物含有壳体和骨头，这也给研究地球早期的远古生命提供了一种途径。
Water is a key to the question of whether life, even in the form of microbes, ever existed on Mars. On Earth, all known forms of life require water.
水是一个是否有生命存在的关键问题，即使是以微生物的形式，火星上和地球上都曾经存在，所有已知的生命都需要水。
For the purposes of this article, the update site, plug-in development environment (PDE), and the Sametime client all existed on the same machine.
出于本文的意图，更新站点、插件开发环境(PDE)和Sametime客户机都位于同一台机器上。
The elephant bird evolved at a time when birds ruled the earth and probably existed on Madagascar for 60 million years until dying out in the 17th century.
象鸟起源于地球上鸟类的繁盛期，据推测在马达加斯加地区存活了近6000万年，直至17世纪这一物种才灭绝。
The elephant bird evolved at a time when birds ruled the earth and probably existed on Madagascar for 60 million years until dying out in the 17th century.
象鸟起源于地球上鸟类的繁盛期，据推测在马达加斯加地区存活了近6000万年，直至17世纪这一物种才灭绝。
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