n.any of several seals lacking external ear flaps and having a stiff hairlike coat with hind limbs reduced to swimming flippers
同义词：true sealhair seal
英汉双解大词典
earless seal
1.
N（名词）
any seal of the pinniped family Phocidae, typically having rudimentary hind limbs, no external earflaps, and a body covering of hair with no underfur 海豹科 (Also called hair seal) → compare eared seal