Assertion: carbon monoxide's effect | /r/CapableOf | build up in a person's bloodstream
Facets:
value: over hours
type: TEMPORAL
value: over even
type: DEGREE
value: gradually
type: MANNER
Source sentences:
text: CO that drifts in and out of a cabin can be dangerous, since the effects of CO are cumulative and can build up gradually in a person's bloodstream over hours or even days before it reaches critical levels.