Subject	submarine
Predicate	can travel
Object	underwater for long periods of time
Modality	Modality Occurrences
Polarity	POSITIVE
Plausibility	0.5326
Neighborhood Sigma	0.5326
Local Sigma	1.0000
Example Sentences	Sentence Occurrences Source submarines can travel underwater for long periods of time without refueling 1 Answers.com Questions