수염고랫과에 속하는 대형 고래의 일종으로, 몸빛은 어두운 회색이고 배는 흰색이며 전 세계 대양에 분포한다.
A large baleen whale (Balaenoptera borealis) that is dark gray with a white underside, found in most oceans.
예문:
"The sei whale is known for its impressive swimming speed compared to other rorquals."
"Conservation efforts have been implemented to protect the endangered sei population in the North Pacific."