Since most planetary scientists believe that water is essential to life, the presence of jarosite means that one prerequisite for life was once present on Mars.
由于大多数行星科学家认为水是生命的基本要素，因此黄钾铁矾的存在意味着火星上曾经存在出现生命的先决条件之一。
"Yes, of course," you may answer, "I buy a present for my mother on Mother's Day, and I give my father a present on Father's Day, too."
“是的，当然。”你可能会回答，“我在母亲节给妈妈买了一份礼物，在父亲节我也给爸爸买了一份礼物。”
She had been given a horse as a present on the day of her first communion.
在第一次领圣餐的那天，她得到了一匹马作为礼物。
The system currently has a need for a fix, which is present on the new TL.
系统目前需要一个修复程序，但是这个程序只在新版本TL 中支持。
The greater sandhill, another subspecies also present on the Platte, is larger.
较大沙丘鹤——也出现在普拉特河的另一亚种——增重更多。
Mr. Jobs was not present on the earnings call with analysts, as some had hoped.
令一些人失望的是，Jobs没有参加与分析师关于收入问题的电话会议。
If it is not found, then the nearest matching combination present on the system is used.
如果未找到，则使用系统上存在的最接近的匹配组合。
An initial check is carried out making sure the user account is present on the AIX host.
第一个检查确认AIX主机上是否存在这个用户账户。
TIP: This is required in order to ensure that certain DLLs are present on the system.
提示：这样做的目的是确保系统上有某些DDL。
IsPresent returns true if the file specified by the path is actually present on the disk.
如果路径指定的文件在磁盘中存在，isPresent返回真。
The scientists then added powdered magnetite, an iron oxide present on Mars, to the flasks.
科学家接着又往烧瓶内加入粉末状磁铁矿和火星上现有的一种氧化铁。
It happily coexists with other installations of Eclipse that may be present on your test machine.
它同其它可能出现在您的测试机上的Eclipse的安装程序能够愉快的共存。
Vista comes with built-in digital rights management features that are not present on Linux boxes.
Vista的出现伴随着内嵌的数字版权管理，而这不会出现在Linux系统中。
There's only one way to prove this to yourself and that's by watching yourself present on video.
只有一种方法可以向你自己证明这个说法，那就是观看你自己的录像。
A much-improved alarm interface was introduced on the N800 and is still present on the newer N810.
N800引入了一个显著改进的警报接口，而且延续到了最新的N8100中。
Instead, they have focused on utilizing the ephemeral disks present on each EC2 host for persistence.
他们转而关注于利于EC2主机上的临时磁盘来做持久化。
To create a VLAN with VLAN tagging, predefined commands are present on icb-tivsam, icb-nfs and icb-itm.
为了使用VLAN标记创建一个 VLAN，icb-tivsam、icb-nfs和icb-itm 提供了一些预定义命令。
In this example, we created a user account with name "sandeep" that is also present on both the AIX machines.
在本示例中，我们创建了一个名为“sandeep ”的用户帐号，这个帐号也存在于两台AIX计算机中。
If a global transaction is present on invocation the component will be added to this global transaction scope.
如果在调用时存在一个全局事务，则该组件会被添加到该全局事务范围。
If you examine this file, you will see all of the services for the localhost that are present on the Web view.
如果查看该文件，您将看到所有用于We b视图中出现的localhost的服务。
Active Directory is Microsoft's implementation of an LDAP server and is present on all domain controllers.
ActiveDirectory是Microsoft的LDAP服务器的实现，存在于所有域控制器上。
When the functions attribute is present on the model, the XForms processor reads it before loading the form.
当 model 元素中含有functions属性时，XForms处理器会在加载表单之前读取该属性。
Ideally, the development could also be done on a command line interface with requirements present on index CARDS.
理想的情况是，看着索引卡上的需求，通过命令行就可以完成开发。
The run time depends on how many groups and users are being changed, and how many files are present on the system.
运行时间取决于系统中有多少组和用户被修改，以及有多少文件。
Yes, she added, she knew how to ride a little; she had been given a horse as a present on the day of her first communion.
她还说，我会骑一点点，因为她收到一匹马当第一次参加圣餐式的礼物。
If the classpath is set correctly but you're still seeing the error, then the desired class is not present on the classpath.
如果类路径设置正确，但是仍然看到这个错误，那么就是需要的类在类路径中不存在。
Also, note here that this example USES pure Ruby and doesn't depend on any command-line utility being present on the machine.
而且要注意，这个例子使用纯ruby，它不依赖于计算机上当前提供的任何命令行实用程序。
For example, it is not present on the latest Mobile Safari browser on the iPhone (version 3.1.3 at the time that this was written.)
例如，它不出现在iPhone(在撰写本文时是版本3.1.3)的最新MobileSafari浏览器上。
Rabies is present on all continents with the exception of Antartica, but more than 95% of human deaths occur in Asia and Africa.
除南极洲以外，其他各洲都存在狂犬病，但95%以上的人类死亡病例发生在亚洲和非洲。
I've had email discussions with a number of readers who present on topics such as health and safety issues or environmental regulations.
我已经通过电子邮件和一些读者进行了讨论，他们曾经出席过与健康与安全或者环保有关的话题的演说现场。
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