1) We have tried to isolate1 some of the key factors. and offer examples of organizations and of some.
2) Factors govern service quality.
3) Organizations manage service well.
4) Organizations manage it poorly.
翻译：大家力图挑选出一些控制服务水平的重点原因，并且提供一些例子来讲明某些机构把服务管理得非常不错，而有的却非常差。
15． Human beings have distinguished2 themselves from other animals, and in doing so ensured their survival, by the ability to observe and understand their environment and then either to adapt to that environment or to control and adapt it to their own needs.
结构：本句只有2个谓语动词have distinguished和have ensured。主干是Human beings have distinguished themselves and ensured their survival。by引导的方法状语后面并列了多个动词不定式to observe and understand/to adapt to/to control and adapt it to，作为ability的修饰成分。
翻译：人类已经将自己与其他动物区别开来，并且通过如此做来确保我们的存活，所依赖的就是通过察看和理解周围的环境，然后适应，控制并且改造该环境，使其合适自己需要的能力。
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