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He'll get much longer sessions and the work will become more interesting every day - longer outruns and more challenging problems to overcome.

训练课的时间大大延长，而且工作的内容每天都变得更加有趣--跑步时间长了，需要解决的问题更难了。

Even the trendy power transferring theory argues against defining the economy-driven emerging powers as "challenging nations", holding the view that this kind of judgment--thinking that the world nears a war as power between nations nearing--is actually oversimplifying the complex roots of war.

即便是时下流行的权力转移理论，也反对将内在经济发展产生的权力变更而出现的崛起中大国定义为&挑战国&，认为这种单纯的大国间实力变化趋近因而容易招致战争的论断事实上是人为地过于简化了战争起源问题的诸多复杂因素。

These grants will help to ensure that food banks, food pantries, and soup kitchens have the equipment and infrastructure necessary to provide healthy, safe food to America's families in need during challenging economic times.

他还说道：&这些赠款将有助于确保粮食银行、供食物储存处、慈善施食处的必要的设备和基础设施，能提供健康、安全的食物给那些在经济困难时期，急需帮助的美国家庭。&

Today's challenging economic times would seem to allow even less room for pleasantries in the business world.

如今越来越严峻的经济形势更使得那些老好人在商场无藏身之所。

Using this model three competence-deficient pneumococci, which was identified by PCR and transformation experiment, were constructed. It is found different strain has different bacterial optimal density for being induced into competence. The optimal density for strains 1, 2 and 22 was 0.1, 0.08and 0.07 respectively. The optimal condition for transformation is c plus y culture at pH8.0. In c plus y culture at pH6.8, which restrained pneumococci forming transformation naturally, pneumococci could be induced to form transformation by CSP.It is concluded that we could induce different S.pneumoniae by CSP into competence in their optimal density in laboratory. 2. It was discussed the relationship between pneumococcal transformation formation and its opportunistic pathogenesis. Comparing their virulence with that of parental strains by challenging mice intraperitoneally and adhering to ECV-304 cell respectively.

结果表明不同肺炎链球菌株的转化最适菌密度不同，1、2和22号菌株的最适转化密度分别为0.1、0.08和0.07；用于转化的CTM培养基最适为pH 8.0的C+Y培养基；在自然转化下不能诱导转化发生的pH 6.8的C+Y培养基中，使用CSP诱导，也能促使细菌发生转化，只是转化效率较低；结论：实验室条件下，不同细菌在一定菌密度时可利用CSP诱导肺炎链球菌成为感受态发生转化。2、为探讨肺炎链球菌转化对毒力表达的影响，本研究分别通过体外粘附人脐静脉血管内皮细胞ECV-304和体内小鼠毒力实验观察1、2和22号肺炎链球菌和其转化缺陷菌株1t、2t和22t毒力的差异。

The war began as a dispute with American privateers challenging the right of British navy ships to inspect and seize their cargoes and ended with the spectacular reprisal of torching the White House.

这场战争起源於美国的私人武装船挑战英国海军舰队权力的争端，先是侦查，进而攫取他们的货物，最后以一把火烧了白宫的壮观报复行动来结束。

Challenging and interesting topics that provokes student's interest.

使用有挑战和有趣的话题刺激学生的兴趣。

General purposed color image segmentation is a challenging and important issue in image processing.

在图像处理中提出的图像颜色分割是一个重要性和具有挑战性的难题。

The sequel to one of the most challenging quizzes ever.

到最具挑战性的测验中的续集。

Universal IQ Booster is a quizzing game filled with problems and puzzles that are informative, challenging and entertaining.

通用智商助推器是问一问游戏的问题和困惑的是内容丰富，充满挑战性和娱乐性。

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。