![Stayingpositivethroughthecoldseasoncouldbeyourbestdefen...]( "Stayingpositivethroughthecoldseasoncouldbeyourbestdefen...")
- 问题详情：Stayingpositivethroughthecoldseasoncouldbeyourbestdefenseagainstgettingill,newstudyfindingssuggest．Inanexperimentthatexposedhealthyvolunteerstoacoldorfluvirus,researchersfoundthatpeoplewithagenerallysunnycharacterwerelesslikelytofallill．Thefind...
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