The other alternatives are attractive in theory but in practice are either impractical or offer only marginal improvements.
其他替代方案在理论上很有吸引力，但在实践中要么不切实际，要么只能提供微不足道的改进。
The second critical decision came in 1979 when it was required that every teacher gain a fifth-year Master's degree in theory and practice, paid for by the state.
第二个重要决定是在1979年做出的，当时要求每位教师都必须获得由国家出资的理论与实践专业五年制硕士学位。
In theory, psychoanalysis is the philosophy of the unconscious mind; in practice it is a means by which mental disorders can be cured.
在理论上，精神分析是一门关于无意识心理的哲学；在实践上，它又是一种治愈心理紊乱的方法。
It should all work fine in theory. But in practice the guardians of Internet security seem badly to need guarding themselves.
这套程序在理论上没有问题，但实践中这些网络卫士看样子非常需要先保护好他们自己。
In a recent book, he says there are "not many ideas that have the potential to matter more for good, not only in theory but in practice."
他在最近出的一本书中说，“能永远都重要的思想不多，不但在理论上是这样，实践也是如此。”
Are your arguments based on an analysis of SOA in theory or how that theory has been implemented in practice?
你的说法是建立在对SOA的理论分析之上的吗？或者这种理论在实践中是如何被实现的？
The idea is sound in theory, but there are evidently still some wrinkles to be ironed out in practice.
尽管这个办法理论上可行，但显然在实际操作上还有许多问题需要解决。
Back in the 18th arrondissement, not far from the cobbled streets of Montmartre, France's secular principles seem neater in theory than in practice.
反观巴黎18区，在蒙马特鹅卵石街区不远处，法国世俗原则在理论上似乎比实践中更有效。
The question, then is whether the IMF’s new facility is as good in practice as it seems to be in theory.
那么问题就是IMF的新工具在实际应用中是否如其理论看上去的那样好。
In theory, this makes partition-type collisions less likely; however, in practice, this rose already has some thorns, as described shortly.
在理论上，这使分区类型更不容易冲突，但在实践中，这种方法也出现了一些问题。本文将在稍后介绍这个问题。
Like brokers, filters are optional in theory but often critical in practice.
就像代理一样，在理论上过滤器可选的，但在实际中却是很关键的。
First, wielding power abroad proved harder in practice than in neoconservative theory.
一是在外国行使霸权，实际操作比新保守主义理论所阐述的更为困难。
Although extremely important in auction theory, in practice Vickrey auctions are rarely used.
尽管这种方式在拍卖理论中占据重要地位，但在实际中，维克瑞拍卖方式却很少被使用。
AWS and Azure are in theory on opposite sides of this divide; in practice they provide the developer with broadly similar capabilities.
理论上aws和Azure应该分别处在该分界线的两端，但是在实际中，他们却为开发者提供了类似的能力。
Data normalization is always recommended in theory, but in practice over-normalization (or normalization without appropriate de-normalization) lead to reliance on joins for data retrieval.
从理论上来说，总是建议您保证数据的规范化；但是在实践中，过度的规范化(或者没有恰当反规范化的规范化)会导致对数据检索连接的依赖性。
History is littered with examples, such as the Seiko Ruputer wristwatch computer, that sounded great in theory but turned out to be lemons in practice.
历史上不乏失败的例子，如精工生产的Ruputer腕表电脑，虽然理念很棒，但在实际销售中却少人问津。
In theory, this sounds great, but in practice, such services are often wrought with controversy. Just a few of many unanswered questions are.
表面看上去确实不错，可是在实践上，这些服务常常引发很多争议。
Controlling the money supply proved far harder in practice than in theory (notably in Britain in the 1980s: Mr Friedman grumbled that the British authorities were going about it in the wrong way).
控制货币供应在实施上证明远比理论要难得多(例如在80年代的英国实施的情况：弗里德曼抱怨说是因为英国当局具体操作上有问题)。
In theory, using the training documents for testing should result in perfect results, but even this is not likely in practice.
从理论上说，使用训练文档进行测试应该能实现最的结果，但实际情况可能并非如此。
Paying into the public scheme should, in theory, mean that foreigners get something back. But in practice, that may be tricky.
从理论上来看，参与公共计划意味着外籍人士会有所得，但是实际上，这可能会有猫腻。
While the other class B shareholders (about 1, 300 of them) could in theory gang up on him and vote against his wishes, in practice that doesn't happen.
当然其他的B股股东（大约有1，300名左右）理论上也可以与他决裂，和他唱反调，但实际中这种事从未发生过。
Potential career paths: an in-depth understanding of accounting theory and practice is great preparation to work as a CPA or manager in the financial services industry.
潜在的职业道路：作为一个注册会计师或者金融服务行业的经理，对会计理论和实务的深入理解是个必备的条件。
In theory, WEP is supposed to make your network secure; in practice, it will only slow down intruders a little bit.
WEP理论上被认为会使您的网络很安全；实际上，它只会略微减缓入侵者的入侵速度。
Such an “internal devaluation” is possible in theory, but it is unusual (and painful) in practice.
这样的“内部贬值”在理论上是可行的，但在实际中并不常见（并且是痛苦的）。
Though possible in theory, the cost and effort of doing so makes this unfeasible in practice.
虽然这个方法理论上可行，但是其成本和代价使其在实际操作中难以实施。
And the second part of the book is devoted to India's speciality: ideas that have prevailed in theory, but not in practice, leaving reformers with nothing more to say, but plenty still to do.
本书第二部份著重探讨印度的专长：理论充满创意，却都没有实行，让改革家已经无话好说，却还有一大堆需要去做。
That approach may sound straightforward in theory, but in practice the vast variety of database structures and possible search terms poses a thorny computational challenge.
这种做法可能在理论上听起来很简捷，但在实践中大量各种不同的数据库结构和可能的搜索词构成了一个棘手的计算挑战。
That approach may sound straightforward in theory, but in practice the vast variety of database structures and possible search terms poses a thorny computational challenge.
这种做法可能在理论上听起来很简捷，但在实践中大量各种不同的数据库结构和可能的搜索词构成了一个棘手的计算挑战。
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