Assertion: engine's piston | /r/CapableOf | accelerate in one direction
Facets:
value: faster
type: MANNER
value: always
type: TEMPORAL
Source sentences:
text: As a result, two pistons are always accelerating faster in one direction, while the other two are accelerating more slowly in the other direction, which leads to a secondary dynamic imbalance that causes an up-and-down vibration at twice crankshaft speed.