As a social confidence coach, helping others overcome their shyness and be more outgoing is the core of my job description.

作为一个培养社交自信的教练，帮助他人克服害羞并变得更加开朗是我工作的核心内容。

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And, says Mr Lynn, "in America, where people are outgoing and expressive, tipping is about social approval."

林恩先生说，“在美国，人们开朗大方，喜欢表现，支付小费是社会认可的。”

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And, says Mr. Lynn, "in America, where people are outgoing and expressive, tipping is about social approval".

林恩先生说，“在美国，人们开朗大方，喜欢表现，支付小费是社会认可的。”

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In using social networks, issuers will need to respect the social nature of the media and focus outgoing messages on discount and promotional announcements and responses to customer inquiries.

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According to the survey, the students at the top of the social hierarchy they were the most "powerful" and respected were also the most considerate and outgoing, and scored highest on measures of agreeableness and extroversion.

WSJ: Weekend Essay by Jonah Lehrer: How Power Affects Us