What are two features of ultrasound?

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  1. #cannot
  2. #short
  3. #useful
  4. #other
  5. #wavelength
  6. #porpoises
  7. #focussed
  8. #animals
  9. #ultrasound
  10. #sound
  11. #frequency
  12. #because
  13. #greater
  14. #humans