Assertion: shutter | /r/CapableOf | obscure the film
Facets:
value: at any given time
type: TEMPORAL
Source sentences:
text: The shutter speed was carefully tuned to allow the correct exposure of the film as it flew past the shutter, which was set at double the speed of the film to account for half of the disc obscuring the film at any given time before it rotated back into place.