Johnston said Twitter's primary function for the airline is to gauge brand perception and to listen to what customers are saying.

Johnston指出，Twitter对于捷蓝航空的主要作用在于测定品牌认知以及聆听客户声音。

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Hallucinogens have their primary effect on perception.

幻觉剂主要是对知觉产生影响。

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In the recent spatial researches, distance perception has been a primary concern for understanding how human beings establishes a memory of location and navigates in an environment.

在空间知觉研究领域，距离知觉是理解人类空间表征和与空间导航的重要窗口。

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Bush's key strengths appear to be his organization and the perception among likely Republican primary voters think he is more electable than McCain.

CNN: Poll: Bush holds slight lead over McCain in South Carolina

With Tuesday's primary results, she has nothing in her arsenal to feed the perception that her campaign should continue.

NPR: Analysis: Clinton Lacks Clear Path to Victory

Policies should not be crafted based on public perception or public misconceptions of economic policy, and equality is not in and of itself the primary goal of a more redistributive state.

FORBES: America��s Love Affair with Being Middle Class