许多人认为奥巴马的增兵计划虽然痛苦，但却必要。
Many view Mr Obama's plan to send more American forces there as a necessary evil.
尤其是如果公民觉得可以参与其中，那么做出困难但却必要的决定会容易一些。
In particular, tough but necessary economic decisions are easier to sell if citizens feel they have had some say in them.
旅游保险费用看起来似乎是没必要的，但却是必不可少的开支。
Taking out travel insurance may seem an unnecessary expense, but it is a must.
新金融秩序面临大考，这场考验不容乐观，但却十分必要。
The new financial order is undergoing its harshest test. It will not be pretty, but it is necessary
而稳定的地区与广大自有住房可以共存，但却没有这样做的必要。
Stable neighbourhoods and widespread home ownership can go together but do not need to.
你没有必要掐着秒表过日子，但却要清楚的认识到自己时间的流逝，不管这流逝是在闲谈，上网亦或者是第三次总结你的周末时光。
You don’t need to spend every second of the day under a stopwatch, but be aware of when you waste time whether it is gossiping, surfing the Internet, or recapping the weekend for the third time.
取消补贴，天然气的费用转移到消费者的肩上是必要的，但却不受民众欢迎。
A big drain on the public purse is subsidised domestic gas prices. Removing the subsidy and passing on the cost of gas to consumers was necessary but unpopular.
在范例11中，我们为electricitydeal加上了select - before - update，这会对瞬时(transient)对象或分离(detached)对象产生额外的select语句，但却能避免不必要的数据库更新。
In example 11, we used "select-before-update" for ElectricityDeal, which incurs an extra select for your transient or detached object. But it does avoid unnecessary updates to your database.
严格执行预算大多数的人理解一个好的预算的必要性，但却很少能够执行它。
DECIDE TO follow the budget. Most people understand the need for a good budget, but few follow through.
db/seeds.rb，该文件对于Rails3 来说并不是新增的，但却有必要着重介绍一下，因为它是最近不久刚增加的功能（在 Rails 2.3.4 版引入的）。
db/seeds.rb is not new to Rails 3, but it's important to mention, because it was added fairly recently (it was introduced in Rails version 2.3.4).
这个工作虽然很细微，但却是必要的，因为它增加了重要的细节，这些细节体现出了整体的效果并使图像看起来更自然。
Subtle, but necessary since it adds the important detail that sells the overall effect and makes the image look natural.
她的任务很棘手但却很有必要。
尽管制造费用很难和具体工作联系到一起，但却是制造成本的必要组成部分。
Although factory overhead normally cannot be identified with the individual jobs, it is an essential component of manufacturing costs.
尽管一时还不能根治它，但却可控可防，若孤立或隔离艾滋病患者，既没有必要，也缺乏科学依据。
Despite a still no cure for it, but it can be controlled prevention, quarantine or isolation of AIDS patients, neither necessary nor a lack of scientific basis.
而由各种神经诊断性检查发现的异常，往往是伴随性的，对此进行治疗可能是正确和必要的。但却不能使病人症状获得改善。
Abnormalities that are noted on various neurodiagnostic studies are often incidental findings whose treatment may be justified and necessary but will not improve the patient's symptoms.
我曾给一些演员写过信，但却从未收到过回复，所以我认为有必要寄这封信以表示我衷心的感谢。
I had given written to a number of actors, but never received a reply, so I think it is necessary to send this letter to express my sincere gratitude.
取消补贴，天然气的费用转移到消费者的肩上是必要的，但却不受民众欢迎。
Removing the subsidy and passing on the cost of gas to consumers was necessary but unpopular.
柯克对《福布斯》杂志表示：“早期的失败虽然不是成功的充分条件，但却是一个必要条件。”
Says Kirk: "Failure early on is a necessary condition for success, though not a sufficient one."
虽然这个比喻有些言过其实，但却充分反映了在现实情况下，会计界对谨慎性原则进行系统研究的必要性和紧迫性。
Although this metaphor is exaggerated but it fully reflects that it is essential and pressing for the field of accounting to study conservatism systemically in realistic cases.
虽然这个比喻有些言过其实，但却充分反映了在现实情况下，会计界对谨慎性原则进行系统研究的必要性和紧迫性。
Although this metaphor is exaggerated but it fully reflects that it is essential and pressing for the field of accounting to study conservatism systemically in realistic cases.
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