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Previous studies had already indicated that clean teeth meant clean lungs, at least among the aged residents of hospitals and nursing homes. 此前已经有研究发现干净的牙齿通常意味着干净的肺，至少对于在医院和疗养院的老年人来说是的。 Microbes in saliva that's breathed in were the most likely source of pneumonia, but the identities of the top offenders were yet to be determined. 唾液中的微生物是造成肺炎的最大嫌疑犯，但至于起主导作用的入侵物到底是什么，还有待确认。 | 
