['engine', 'operate', 'EmptyParameter', 'efficiency', 'at']
["Synset('wheeled_vehicle.n.01')", 'other_cos-45.4', 'EmptyParameter', "Synset('state.n.02')", 'at']
Engines are operating at almost 90 % efficiency.
Synset('wheeled_vehicle.n.01') are operating at almost <NUMBER>2 <PERCENT>0 Synset('state.n.02').