Subject	echoes
Predicate	can
Object	used
Modality	Modality Occurrences TBC[speed of sound] 2
Polarity	POSITIVE
Plausibility	0.0328
Neighborhood Sigma	0.0525
Local Sigma	0.0329
Example Sentences	Sentence Occurrences Source echoes can be used to determine distance 2 Google Autocomplete echoes can be used to measure the speed of sound 2 Google Autocomplete echoes can be used 1 Answers.com Questions