哥斯达黎加人民对中国怀有友好的感情，感谢中国提供的宝贵帮助。
The Costa Rican people hold friendly feelings towards China and thank for China's help.
这是因为当哥斯达黎加人要求对他们自己的幸福感以10分制来打分时，平均分值为8.5。
That's because Costa Ricans, asked to rate their own happiness on a 10-point scale, average 8.5.
他自己在希腊人群中进行的前期研究给出了微弱的证据支持午睡设想，但是另外一个在哥斯达黎加人中进行的大型研究没有显示两者有联系。
His own earlier research in a Greek population provided weak evidence in favor of the nap hypothesis, but another, larger study, conducted in Costa Rica failed to show an association.
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