Gratitude is an effective tool largely because " it is a precursor to develop trust ," says Betsy Bugg Holloway , a marketing professor at Samford University in Birmingham , Al .
感激之所以是一个有效的工具，主要原因在于“它是建立信任的前兆，”阿拉巴马州伯明翰市桑佛德大学（SamfordUniversity）营销学教授贝特西•布格•霍洛威这样说道。
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