Laboratory experiment: Listen & Download Laboratory experiment .mp3 Error! Change your browser, please! ⇓ Download Electronic sounds ⚠ Whip pillow ⚠ Opening, closing doors,, Freight elevator ⚠ Harvesting machine ⚠ Retraction of the telescopic, Extension ⚠ Bicycle rear wheel ratchet ⚠ Fishing reel ⚠ Makes sounds, The robot moves ⚠ Rope fall ⚠ Electronic bird singing ⚠ Metronome ⚠ Trampoline (diving) ⚠ ★★★★★