天山4中的一句话不明白，谁能帮忙翻译一下，谢谢

雨薇

Until recently, zoologists believed that all species of phocids (true seals), a pin-nipped family, use a different maternal

 strategy than do otariids (fur seals and 
            sea lions), another pinniped family. Mother otariids use a foraging strategy.

phoenixfr

直到最近,动物学家仍然认为所有总类的pinnipped 科的phocids(true seals)采取一种与另外一种pinnipped 科的的生物otariids(fur seals and sea lions)不同的母性策略.otariids妈妈使用的是foraging策略.