Assertion: bluefin tuna's fin | /r/CapableOf | retract into slot
Facets:
value: quickly
type: MANNER
value: to reduce drag
type: PURPOSE
Source sentences:
text: The large flexible first dorsal fin and the paired pectoral and pelvic fins quickly retract into slots to reduce drag at high speed.
text: The large flexible first dorsal fin and the paired pectoral and pelvic fins quickly retract into slots to reduce drag at high speed.