'A "watch"dog really uses its hearing--dogs hear frequencies up to 45 of these units, kHz; humans, just 20'
kilohertz
MEASUREMENT: A watchdog really uses its hearing--dogs hear frequencies up to 45 of these units, kHz; humans, just 20
A "watch"dog really uses its hearing--dogs hear frequencies up to 45 of these units, kHz; humans, just 20
A "watch"dog really uses its hearing--dogs hear frequencies up to 45 of these units, kHz; humans, just 20
MEASUREMENT
kilohertz
MEASUREMENT