在一项研究中，研究人员对137名大学生开展了一项关于他们对朋友或情侣表达感谢的频率的调查。
In one study, 137 college students completed a survey regarding how often they expressed gratitude to a friend or partner.
第一项研究中，研究者对137位大学生开展了关于他们对朋友或情侣表达感谢频率的调查。
In one study, 137 college students completed a survey regarding how often they expressed gratitude to a friend or partner.
第一项研究中，研究者对137位大学生开展了关于他们对朋友或情侣表达感谢频率的调查。
In one study, 137 college students completed a survey regarding how often they expressed gratitude to a friend or partner.
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