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 one does not exist, the container supplies one.
如果不存在，则容器提供一个事务。
If they exist, make a point of going.
如果它们存在，做一个去点。
And, we say that a function is differentiable if these things exist.
我们说一个函数是可微的，如果这些偏导数存在。
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。
You need to create this file if it does not exist.
如果这个文件不存在，就需要创建它。
If they exist, each string would be as thin as a proton, but incredibly dense.
如果宇宙弦存在，每根弦都像质子一样小，密度却极大。
A report can be generated to see if any major issues exist.
可以生成一份报告来查看是否存在任何重大问题。
Lies only exist if we believe in them.
谎言只有我们愿意相信，它才会存在。
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。
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。
If aliens exist, where are they?
如果外星人存在，他们会在哪里呢？
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。
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”。
So, if it didn’t exist already how was it made later?
所以，如果最开始钱并不已经存在，那后来是怎么被弄出来的？
If these people exist, we will not be able to afford them.
即使存在这样的人，我们也负担不起。
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。
So, if it didn't exist already how was it made later?
所以，如果最开始钱并不已经存在，那后来是怎么被弄出来的？
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。
That's good advice, even if these approaches didn't exist.
即使不存在这些方法，这也是一个很好的建议。
If it does exist, we will use the new value and reexec.
如果存在，则使用新的值并重新执行。
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。
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。
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