可以治疗白癜风吗 http://baidianfeng.39.net/bdfby/yqyy/Offtheruggedcoastofthepacificnorthwest,podsofkillerwhalesinhabitthefrigidwaters.Eachfamilyisabletosurviveherethanksmainlytoonemember,itsmostknowledgeablehunter:thegrandmother.Thesematriarchscanliveeightyyearsormore,whilemostmalesdieoffintheirthirties.在崎岖的太平洋西北部海岸线，一群虎鲸生活在冰冷的海水里。每个虎鲸家庭之所以能够在这里生存，是因为它们的一个家庭成员，是经验丰富的猎手：它们的祖母。这些女族长们可以活八十年或者更多，而家庭中的男性成员通常在它们30多岁时死去。Thoughkillerwhalesinhabiteverymajorocean,untilrecentlyweknewverylittleaboutthem.ThedetailsoftheirliveseludedscientistsuntilanorganizationcalledtheCenterforWhaleResearchbeganstudyingasinglepopulationnearWashingtonStateandBritishColumbiain.Thankstotheirongoingwork,we’velearnedagreatdealaboutthesewhales,knownastheSouthernResidents.Andthemorewelearn,themorethispopulation’selders’vitalrole
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