The first and the third can be key factors in the structure of a biological community; that is, all the populations of organisms living together and potentially interacting in a particular area.

第一个和第三个可能是生物群落结构的关键因素；也就是说，所有的生物种群都生活在一起，并且它们可能在一个特定的区域内相互作用。

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Changes in food needs, living standards, climate and other factors call for new avenues of research, according to the report.

根据该报告，粮食需求、生活水平、气候和其它因素的变化呼唤人类探索新的研究途径。

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Some economists believe that selling goods and services to consumers on an installment plan is one of the major factors in making our high standard of living possible.

一些经济学家认为，用分期付款的方式向客户销售商品和劳务是提高人们生活水平的一个重要因素。

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Mercer's survey results are based on an analysis of local living conditions comprising 39 factors in 10 categories.

CNN: What city has world's best quality of life?

We also incorporated Economy.com's business cost index, which looks at labor, tax, energy and office space costs and its living cost index, which factors in housing, transportation, food and other household expenditures.

FORBES: Best Places For Business And Careers

To compile the list, we crunched data on more than 400 cities from every state, looking at factors ranging from living costs and taxes to crime to the availability of doctors and the opportunity to stay active with outdoor exercise and volunteer work.

FORBES: The Best Places To Retire In 2013