He thought that if he couldn't see something, it didn't exist.
他认为如果他看不见某种东西，它就不存在。
If society is to exist as a unity, its members must have shared values.
社会若要成为一个统一的群体，它的成员就必须有共同的价值观。
Like an ostrich, she thought that if she couldn't see me, then I don't exist.
就像只鸵鸟一样，她以为如果她看不见我，那么我就不存在。
If he does not exist, everything depends on us.
如果他不存在，一切将由我们而定。
We know that rational knowledge exists before experience, so if to exist is to experience we must always have both sources of knowledge.
我们知道理论知识是先于实践而存在的，所以如果存在就是能感知，我们必须既有理论，又有实践。
If joins already exist in the source model, it will be automatically suggested in the mapping editor.
如果连接已经存在于源模型中，那么它将会自动在映射编辑器中显示。
As the name suggests, it draws a line between the two airport markers if they both exist.
顾名思义，它在两个机场标记之间画一条线(如果它们都存在的话)。
Take a look at existing employee files or, if no files exist, gathering all the papers into coherent personnel files.
看看现有员工档案，如果没有档案存在，收集所有文件成为一份连贯的人事档案。
The fourth quadrant (prudent and inadvertent) seems like it shouldn't exist - if you are prudent, how can it be inadvertent?
第四象限(谨慎、无意)似乎是不存在的—如果您是谨慎的、您有怎么可能疏忽呢？
Although software has become ubiquitous and critical for our daily existence, the fundamental laws of software development, if they exist, have yet to be discovered.
虽然软件对于我们的日常生活已经变得普遍存在并具有决定性，但是软件开发的基本准则，如果存在的话，还没有被发现。
So as long as you think you think and you will think in concepts so there your reasons if concepts exist.
只要你思考并且将来也会在概念中思考，这就是你相信思考存在的理由。
If different versions exist, there are structural changes between the baselines, as shown in Figure 19.
如果有不同的版本存在，那么在基线之间将会有结构性的改变，如图19所示。
Both of these methods return an empty string if the attribute doesn't exist.
如果属性不存在，那么这两种方法都将返回空字符串。
Last year, a Vatican astronomer, Guy Consolmagno, speculated that if aliens exist, they might have souls and he offered to reach out, touch and baptize them.
去年，一位梵蒂冈天文学家，盖伊-肯搜马格诺推测；如果外星人存在，它们可能就有灵魂，盖伊就要伸出手，给它们施行洗礼。
Often, due to development timeline pressure, documentation might not exist, or, if it does exist, it might not be in synchronization with the physical data model in production.
通常，由于开发时间的压力，可能未创建文档，或者即使创建了文档，该文档也可能与生产的物理数据模型不同步。
Listing 6 shows the syntax that checks to see if the files exist.
清单6显示了用来检查该文件是否存在的语法。
If doesn't exist, exit the command or script and display the error message set with.
如果不存在，就退出命令或脚本并显示用设置的错误消息。
If the truth be known coronary artery disease is a toothless paper tiger that need never, ever exist and if it does exist it need never, ever progress.
如果每个人都知道一个真相，那么冠心病就会像纸老虎一样，根本就不存在了，就是存在，也不会对你造成危害。
When they look at this diagram they look past the upper left corner; as if it doesn't exist.
当他们看这张图表的时候，他们会略过左上角，就好像左上角不存在一样。
You first drop the tables, if they exist, so that you can cleanly create new tables with the exact column definitions you need.
如果存在的话，首先放弃这些表，以便您可以用所需的正确的列定义创建新表。
For example, if multiple namespaces exist, the user will be required to select a namespace.
例如，如果存在多个名称空间，就要求用户选择一个名称空间。
If doesn't exist or is NULL, exit the command or script and display the error message set with.
如果不存在或者是NULL，就退出命令或脚本并显示用设置的错误消息。
Then you create the index if it doesn't exist and add the item to it.
然后创建这个索引(如果尚未存在的话)并把条目添加到其中。
These, if they exist, would be fossil traces of black holes from the pre-Big Bang version of reality.
如果存在的话，那么这些“大圈”便是“前大爆炸”所产生的宇宙中黑洞的“化石”。
If the path doesn't exist, DB2 installer creates it during installation.
如果这个路径不存在，DB 2安装程序会在安装期间创建它。
If they don't exist, then you'll want to develop some, or better yet, adopt existing ones from industry.
如果不存在，那么您希望开发一些，或更好的是，采用现有的行业标准。
Aliens, if they exist, are most likely to live along the line between shadow and light, a temperate region known as the terminator, the scientists said.
“如果上面真有外星人，他们可能会住在昼夜分割线附近，这样就可以随意穿梭于黑夜与白昼之间了。”某科学家如是说。
Aliens, if they exist, are most likely to live along the line between shadow and light, a temperate region known as the terminator, the scientists said.
“如果上面真有外星人，他们可能会住在昼夜分割线附近，这样就可以随意穿梭于黑夜与白昼之间了。”某科学家如是说。
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