it had long been something of a mystery where, and on what, the northern fur seals of the eastern pacific feed during the winter, which they spend off the coast of north america from california to alaska.

feed on+ n 에서 what 이 on을 데리고 앞으로 갔나여?
왜 데리고 갔는지.. 궁금해여~~~부탁 드립니다