ego psychologists
自我心理学家
以上为机器翻译结果，长、整句建议使用 人工翻译 。
But, psychologists say, grossly overtipping can also be a sign of a large ego ("look at this money I'm throwing around") or a thinly veiled attempt by an insecure person to buy approval.
FORBES: What Tipping Tells About Your Mate
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