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。
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 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。
If he does not exist, everything depends on us.
如果他不存在，一切将由我们而定。
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。
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。
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 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。
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？
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。
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。
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)。
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。
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。
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。
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。
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, return.
如果不存在或者是NULL，就返回。
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”。
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。
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。
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 it doesn't exist, you need to create a service interface for your compensation service.
如果它不存在，则需要为补偿服务创建服务接口。
If I don't exist, how can it be bad for me that I'm dead?
如果我不存在，那死亡对我又有什么不好呢？
This suggests that if there exist arbitrage opportunities in the field of commodity, it is almost impossible to prevent people from doing that.
这表明，如果商品领域中存在套戥机会，几乎很难防止有人不这样做。
The file is created automatically if it doesn't already exist.
如果该文件尚不存在，则自动创建它。
If doesn't exist, return NULL.
如果不存在，就返回NULL。
If doesn't exist, return NULL.
如果不存在，就返回NULL。
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