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。
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。
我们靠吃大米过活。
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。
They existed on vegetable food.
它们靠植物性食物生存。
Dinosaurs actually existed on earth once.
恐龙确实曾经存在于地球上。
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。
Its main goal is to determine if life ever existed on Mars.
它的主要目标是确定火星是否存在过生命。
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。
Regarding eternal happiness, I wonder whether it has existed on the earth.
至于永恒的幸福，我怀疑世上是否真正有过。
RESULTS: 19 peaks existed on the HPLC fingerprint of Compound Fufangteng Mixture.
结果：标示出复方扶芳藤合剂19个共有峰。
Buster Douglas: "it's like I made my mark, it's proof that I existed on this planet."
道格拉斯：“好似刻了个记号，做为我存在于这个星球的证明。”
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。
Two fundamentally different orogenic systems have existed on Earth throughout the Phanerozoic.
地球上有两套完全不同的造山系统一直存在于显生宙。
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。
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。
Our results showed that, during the spore purification, this protein persistently existed on the spore surfaces with great amount.
我们的试验结果表明，在纯化、洗涤芽孢的过程中，该蛋白持续且大量的存在于炭疽芽孢表面。
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。
This heavyweight is challenging astronomers' theories of star formation, smashing through the upper limit they thought existed on star mass.
这颗重量级恒星颠覆了天文学家的恒星形成理论，他们认为恒星的质量存在一个最大上限。
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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