The screen components layout, if they exist
屏幕组件布局（如果它们存在的话）
These organisms, if they exist, are most likely to be found in groundwater.
这些生物体，如果存在的话，最可能会在地下水中找到。
Reference to the "feedback" component needs to be added in the HTML markup to display any validation errors if they exist, as shown in Listing 12.
对 "feedback"组件的引用也需要添加到HTML标记以显示可能存在的验证错误，如清单 12 所示。
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。
The "Call" object allows you to set HTTP user ID and password for basic auth, and also similar methods to cater for intermediate HTTP proxies, if they exist.
“Call”对象允许您为基本认证设置HTTP用户标识和密码，以及中间 HTTP代理（如果它们存在的话）所需的类似方法。
We easily come to doubt if they exist.
我们很容易怀疑它们是否存在。
What else may lurk in those salty pools, if they exist, remains to be seen.
如果洞穴存在，那些盐水池中还会隐藏着什么，这有待发现。
Frequently, developers want to call new functions if they exist on the host version.
开发人员常常想要调用新的函数(如果它们存在于主机的Windows版本上的话)。
The method may be a table scan , or may be scanning one or more indexes if they exist.
可能采用的方法包括扫描表和扫描一个或多个索引（如果有） 。
Run your changes against any existing tests if they exist and create new ones when needed.
在任何已有的测试(如果存在)上运行你所做的改动并在必要时创建新的测试。
Detection of these conditions and stoppage of the loom, if they exist, are the functions of a warp stop motion.
经停机构用来检测上述的情况，一旦断头或松经发生，便立即使织机停车。
By 2020, the average person will have more than four Internet-connected devices, but they won't be very useful if they exist in silos.
到2020年，每个人平均将拥有超过4台物联网设备，但如果它们彼此孤立，就不会发挥什么作用。
As infrared telescopes improve, scientists should eventually be able to measure the distance to GRBs with red shifts greater than 7 - if they exist.
随着红外望远镜技术的提升，科学家最终总能测定红移量大于7的GRB爆发的距离，如果它们存在的话——这是一个重大假设。
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。
Unfortunately we are unable to test any of these theories as we cannot experience (and measure) the fundamental constants in alternate universes (if they exist), so this is a speculative study.
不幸的是因为我们无法体验(并测量)其它宇宙(如果存在的话)中的基本常量，因此我们无法验证这些理论，所以说这是一个推测性的研究。
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。
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。
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