Since such a large proportion of their fat stores is exhausted despite feeding, mother seals clearly cannot support all of lactation using only energy stored before giving birth.

由于如此大比例的脂肪储备在喂养过程中会消耗殆尽，海豹母亲显然不能仅靠生育前储存的能量来维持整个哺乳过程。

youdao

The maternal strategy evolved by harbor seals may have to do with their small size and the large proportion of their fat stores depleted in lactation.

麻斑海豹进化出的母性策略可能与它们的小体型和哺乳时消耗掉的大部分脂肪有关。

youdao

Whales, seals and penguins cope with the consequent danger of freezing up by burning vast amounts of food to keep their bodies warm and by insulating themselves with thick layers of fat.

鲸鱼，海豹和企鹅要应付随之而来的冻僵危险，可通过消耗大量的食物保持体温及自身一层厚厚的脂肪保暖。

youdao

In the death zone between the rock shoals and the breakers, two grey seals float and turn, fishing, peering, wallowing like fat ladies in a spa pool.

BBC: Hiking Wales�� storied coastline

There are rumors of rogue walruses that prey on seals, puncturing them with their tusks, then sucking out the fat with their powerful mouths.

NEWYORKER: Stone Mattress