Assertion: dolphin | /r/AtLocation | the surface
Facets:
value: to replenish their air supply
type: PURPOSE
value: periodically
type: TEMPORAL
Source sentences:
text: Dolphins can't breathe water like fish, but need to come to the surface to breath air.
text: If they can’t get to the surface, they can drown in a matter of minutes.
text: Dolphins, like whales, need to periodically come to the surface to replenish their air supply.