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Whatisayawn(哈欠)andwhydopeopleyawn?Ayawnisoftenassociate...
問題詳情:Whatisayawn(哈欠)andwhydopeopleyawn?Ayawnisoftenassociatedwithapersonbeingtired.__1__Peopleyawnformanyreasonsincludingstress,boredom,emotionandoverwork.Haveyounoticedthatyawningseemstobecontag...