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There are a great number of last names in Sardinia - more than 30,000,
撒丁島上有許多姓氏，超過30000個，
but not many last names for the centenarians we have certified.
但是沒有多少姓氏被證明有百歲老人。
Among these, there are some last names that show a fairly consistent percentage of centenarians.
這其中，有一些姓氏顯示出有相當比例的百歲老人。
It's these ultra-healthy families like the Vaccas that make Sardinia unique.
象Vaccas這樣的超健康家族讓撒丁島變得很獨特。
The challenge for Professor Deiana is to find out why.
Deiana教授面臨的挑戰(zhàn)是找到其中的原因。
Maria's nephew, Alessandro Vacca,
Maria的侄子，Alessandro Vacca
can trace his family history in Ovodda back over several generations.
可以將他的家族史上溯幾代人。
For hundreds of years, the Vaccas have lived in relative isolation from the rest of the world,
幾百年來，Vaccas的生活與世隔絕，
marrying into almost every other family in the town.
與鎮(zhèn)上幾乎每一個其他家族都有通婚。
In fact, most people living in the town today are descended from only a few original settlers.
事實上，如今鎮(zhèn)上生活的大多數(shù)人，只有少量是原定居者的后裔。
Marriage among relatives is not the rule, but there are some cases of this taking place.
姻親不是規(guī)律，但是也是這里的個案。
From a genetic point of view, when this happens,
從遺傳的角度來看，在這種情況下，
there's a higher probability of having genetic diseases
會有一個較高的遺傳性疾病的概率，
but also of having positive results - like centenarians.
但是也有積極的成果——比如百歲老人。
