1·What happens to otters seems to depend on whether the location where they live is accessible to orcas or not.
海獭数量的增减取决于它们生存的地方逆戟鲸是不是可以进入。
2·The San Francisco group is leading efforts against keeping dolphins, orcas and other advanced sea life in captivity.
这个旧金山的组织正在带领大家努力去反对圈养海豚、逆戟鲸和其它高级海洋生命。
3·However, because orcas are so large, they can't access shallow or rocky locations.
然而，因为逆戟鲸个头很大，所以他们不能进入那些过浅或者充满岩石的海域。
4·So, it probably is the orcas that are causing the decline of all the smaller sea mammals mentioned in the passage - the seals, the sea lions, and the sea otters.
所以，很可能是逆戟鲸的捕食导致了文中提到的诸如海豹、海狮和海獭等小型哺乳动物的数量减少。
5·Only widely occurring predators, such as the orca (a large predatory whale), could have the same effect, but orcas prefer to hunt much larger prey, such as other whales.
除此之外，只有像逆戟鲸（一种大型肉食鲸）那种食性广泛的动物才能通过捕食呈现相同的效果。但是，逆戟鲸更喜欢捕食像鲸类这种的大型猎物。