From there on, the remaining chapters are captivating natural history, arranged in neatly named sections: "fluff", how feathers keep birds warm and dry.

从那开始，剩下的章节都是引人入胜的自然史，以巧妙命名的章节排列：“绒毛”，羽毛如何让鸟类保持温暖而干燥。

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Unnecessary C-sections are costlier than natural births and raise the risk of complications for the mother, said the report surveying nine Asian nations.

报告调查了九个亚洲国家后声称，不必要的剖腹产比顺产费用更高，并且增加了产妇患并发症的风险。

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The guidelines contain updated sections on definition, epidemiology, natural history and pathophysiology. The main focus is on diagnosis and risk stratification, treatment and management strategies.

指南对定义、流行病学、自然病程和病理生理学部分做了更新，重点在于诊断、危险分层、治疗和处理策略。

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C-sections are more expensive than natural deliveries and result in longer hospital stays and more risks for the mother, including infection.

WSJ: Push to Reduce Rates of Early Term Induced Deliveries

On the average Nicklaus, Dye or Fazio course, the layout of the third hole has little to do with your experience on fifteen, and when the course does build to a crescendo of some sort, or feature sections that are thematically different, this is dictated by the natural site, such as an oceanfront finish.

FORBES: My Brilliant Solution To Brazil's Olympic Golf Course Debate

Preserving more natural areas, including ancient redwoods in California, and bringing the last remaining sections of the Appalachian Trail under public control.

CNN: Clinton Marks Earth Day With Trail Project