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Although the recurrent pectus excavatum repairs are technically more challenging than the primary surgery, the non-thoracoscopic Nuss procedure for reoperative correction is a safe, effective and rel iable method.

复发漏斗胸再次手术矫正虽较初次手术更困难，但只要掌握手术原则、技巧，仔细操作，非胸腔镜辅助下行Nuss 手术二次矫正仍然是安全有效的。

As compared to our ancestors in the field of strongly correlated condensed matter physics half a century ago, we are facing with much more challenging problems which are often beyond the capability of the traditional perturbative methods, although we already have many more advanced analytical tools at our disposal.

与半个世纪前强关联凝聚态物理领域的研究人员相比，现在的我们有更多的高级解析工具可用，但我们所面对的问题也变得更难了，在许多情况下传统的微扰近似的方法都已失效。然而，对这些问题我们也并不是毫无希望的。

But the increasement of requirement is challenging this kind of design philosoph.

如何将分散在各个子层的特性参数协调融合，以提升超宽带网络的性能，这些就对超宽带无线通信系统的设计提出了新的挑战。

The most important and the most challenging task in academic research in the field is to prepare a theoretical foundation for the revolution in moral philosoph...

基因技术发展导致道德哲学革命的最深刻的原因，在于它颠覆了&自然人—自然家庭&这个&文明时代&一切道德哲学的基础。

Pneumatosis intestinalis and portomesenteric venous gas are alarming radiological findings that signify bowel ischemia. The management of PI and PMVG remain a challenging task because clinicians must balance the potential morbidity associated with unnecessary surgery with inevitable mortality if the necrotic bowel is not resected.

肠气囊肿病和门脉肠系静脉积气在影像诊断学上是缺血性肠道疾病非常重要的表现，当病人的影像出现肠气囊肿病或是门脉肠系静脉积气时，临床医师要如何作最适当的处置，依然是一项富挑战性任务，因为如果坏死的肠组织没有被切除，无可避免的会造成病人死亡，但是多余的手术亦会有潜在的并发症。

But because this system also involves to the intense conflict right between the right of work and the Employer\'s right of management,the enterprises\' individual benefits and the social benefit of encouraging human resources flowing and so on,from the beginning to now,The system of POBS has been developed in the challenge and Approval.There is still some challenging voice even today.

但是由于该制度还涉及到劳动权与用人单位经营权之间的激烈冲突、企业个体利益与鼓励人才流动的社会利益的冲突等，竞业禁止制度在产生之初至今就一直在认同与质疑之声中逐步发展与完善，即使在今天仍有不少质疑的声音。

Besides introducing the existed methods of creating items, this paper advances not only my own opinions on how to assess the processive objectives mentioned in the Curriculum Standards, as is a novel and challenging problem, but also new thoughts on designing items in the form of example.

除了介绍已有的命题方法，本文还对怎样评价课程标准中提出的&过程性目标&这一新颖、而又极具挑战性的问题，提出了自己的看法，并以案例的形式详述了设计试题的新思路。

Customer segmentation is a critical step to the success of target or segment marketing. The effectiveness of customer segmentation depends on a good number of variables such as customers' demographic, behavioral, geographic, and psychographic characteristics. However, the huge combinations and correlations among variables make customer segmentation a challenging task, even with the aids of information technologies. The industry is desperate for effectual and powerful tool for excavating customer knowledge from the large accumulated data in the corporate database management system.

摘要顾客分群对於目标行销或市场切割的成功与否都是一个重要的关键步骤，顾客分群结果的优劣取决於其所采用的分群因子，顾客分群中常使用的分群因子有顾客的人口统计资讯、行为特徵、地理性资讯与心理方面的特徵等，然而，这大量与因子复合交错的资讯使得顾客分群成为企业的一个挑战，并且渴望寻求一个能够从大量累积的资料库系统中挖掘知识的工具。

"None of this need have happened if Starbucks had stayed private and grown at a more controlled pace," says Quelch."To continue to be a premium-priced brand while trading as a public company is very challenging."

&如果星巴克保持个性化并且增长于可控制的速度，这些问题都不会发生，& Quelch 说，&像普通公司一样做生意同时保持一个溢价品牌是非常具有挑战性的。&

In this challenging economic time, nonprofit organizations must rededicate their efforts in the specific or targeted areas of marketing and fundraising.

在这个充满挑战的经济时间，非营利组织必须再次确认，在营销和筹资的具体和有针对性的领域的努力。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。