The Caspian seal, also now endangered, has declined in population by 90 percent over the past 100 years because of unsustainable hunting and degradation of its habitats.

里海海豹，也由于不可持续的狩猎和栖息地的退化而濒临灭绝，其数量已经在过去的100年中减少了百分之九十。

youdao

Adding to its complexity, Kashagan lies at the heart of a delicate ecosystem, home to many species unique only to these waters, such as the sturgeon and the rare Caspian seal.

让情况更为复杂的是，卡沙干附近的海域里很多物种都是那里独有的，如鲟鱼和里海海豹。

youdao

Before drilling began last August, environmentalists said they were worried about its possible impact on the Caspian's seal and sturgeon populations.

ECONOMIST: Oil and the seals of Kazakhstan