Probably the most common reason for using composite keys is for backwards-compatibility.
使用组合键的最常见的原因或许就是为了向后兼容。
I don't want to break backwards-compatibility with HTTP, and there is no better protocol available for the business of doing REST.
我不喜欢破坏HTTP的向后兼容性，而且没有更好的协议去支持REST的工作。
The reason for this arrangement: backwards compatibility.
这样安排的原因是：向后兼容。
It is worth stressing that, unless you require backwards compatibility, there is no reason to write new JMS applications using the old queue and topic interfaces.
值得强调的是，除非需要向后兼容性，否则没有理由用老的队列和主题接口编写新的JMS应用程序。
I know the extra two characters are annoying; I know this will break backwards compatibility.
我知道这两个额外的符号十分讨厌；我也知道这将会破坏向后兼容性。
Any change to an API of that kind will break backwards compatibility and cause a lot of trouble.
这种类型的API的任何变化都有可能破坏向后的兼容性，引起大量问题。
Loose - Any incompatible change results in a new version of the service contract and the contract is designed to support backwards compatibility and forwards compatibility.
松散——所有不兼容的更改导致服务契约的新版本，且服务契约的设计既支持向后兼容，也支持向前兼容。
Can you get a 2.0 processor that supports backwards compatibility?
能找到支持向后兼容的2.0处理程序吗？
Flexible - Any incompatible change results in a new version of the service contract, and the contract is designed to support backwards compatibility but not forwards compatibility.
灵活——所有不兼容的更改导致服务契约的新版本，契约的设计支持向后兼容，但不支持前兼容。
Breaking backwards compatibility has been controversial.
打破向后兼容性引起了争议。
XHTML 2.0 [in development] is a rewrite of XHTML without considerations of backwards compatibility with HTML.
XHTML 2.0[开发中]是对XHTML的重写，没有考虑与HTML的向后兼容。
To ease transitioning 1.0 stylesheets to 2.0, vendors can supply (at their option) a 2.0 processor that supports backwards compatibility (BC).
为了便于从1.0样式表迁移到2.0，厂商可以(根据自己的意愿)提供支持向后兼容(BC)的2.0处理程序。
This is one of the key ways that an ext3 filesystem maintains backwards compatibility with ext2 metadata, and in turn, the ext2 filesystem driver.
这是ext3文件系统保持对ext2元数据，以及ext2文件系统驱动程序的向后兼容性的关键方式之一。
However, the underlying code for distributing software is still the same and provides backwards compatibility to Everyplace Access V4.3.
然而，下面的用于分发软件的代码仍是相同的并为EveryplaceAccess V4.3提供了向后兼容。
The idea was that Python 3000 would be the first Python release to give up backwards compatibility in favor of making it the best language going forward.
因此，Python 3000将会作为第一个放弃向后兼容性的Python版本，目的就是要让Python向着最好的语言前进。
Unfortunately Excel’s methods are designed for backwards compatibility and do not necessarily give the right answers. To wit Luca says
可惜的是，Exce的方法被设计为向后兼容，并且有时候不一定能给出正确的解答。
If you are planning on using models in a previous release of the product, choosing model instead of Package will help prevent a backwards compatibility issue.
如果您打算在这个产品的早期版本中使用模型，那么选择Model替代Package将会阻止一个逆向兼容性问题。
Because of normal Windows domain behavior and backwards compatibility this can be more or less appropriate for your corporation.
由于正常Windows域的运转需要和向后兼容问题，这种情况或多或少都会在您的公司中出现。
If specific 2.0 features are desirable, then you can try to patch 2.0 version islands in your 1.0 stylesheet, and run it using a 2.0 processor that supports backwards compatibility.
如果需要特定的2.0特性，可以尝试在1.0样式表中补上2.0版的孤岛，使用支持向后兼容的2.0处理程序运行它。
Although many improvements have been made to the core language, the new version will break backwards compatibility with the 2.x line. Other changes have been anticipated for a while, such as.
虽然新版本对该核心语言做了很多改进，但还是打破了与2 .x版本的向后兼容性。
IronPython 2.0.1 focuses on performance improvements, while keeping complete backwards compatibility.
IronPython2.0.1关注于性能方面的改进，并确保百分百地向后兼容。
If you do not have access to a 2.0 processor that supports backwards compatibility, then you must choose option 1, 5, or a subset of option 4, where every bug fix must be a 2.0 solution.
如果没有支持向后兼容的2.0处理程序，就必须采用选项1、5或者选项4的一个子集，所有的bug修正必须采用2.0方式。
Note - the terms "backwards compatibility" and "forwards compatibility" are explained in the description for Compatible Change (465) in Chapter 16.
注：这里的“向后兼容”和“向前兼容”在第16章的兼容性变更(Compatible Change, 465)里有具体介绍。
Beck and Gamma have striven to maintain both forwards and backwards compatibility.
Beck和Gamma努力维持向前和向后兼容。
While these interfaces are quite humble on the surface, they expose the rather complex story of backwards compatibility, interoperability, and the role of covariance.
尽管这些接口表面上看起来是如此稀松平常，但是它们却暴露出关于向后兼容性、互操作性、以及协变的作用等相当复杂的故事。
DHH: Major versions usually indicate that backwards compatibility is no longer guaranteed.
主干版本通常意味着向后兼容性不再被保证。
New for 2.0, this function can also test for all three optional feature modules described in Part 3 of this series: Schema Awareness, Backwards Compatibility, and Serialization.
这是 2.0 中新增加的函数，也可用于测试本系列 第 3部分所述的三个可选特性模块：模式感知、向后兼容和序列化。
The security in backwards compatibility is nice, but if you’re looking to get the best response from the larger mobile audience it’s best to define specific CSS files for unique occasions.
另外，浏览后退的安全性非常不错，但是，如果你需要与更多的手机用户进行互动，最好的方式是设定专属时间段，并对CSS文件进行特别定义。
The security in backwards compatibility is nice, but if you’re looking to get the best response from the larger mobile audience it’s best to define specific CSS files for unique occasions.
另外，浏览后退的安全性非常不错，但是，如果你需要与更多的手机用户进行互动，最好的方式是设定专属时间段，并对CSS文件进行特别定义。
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