Balloon descent:
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Air is bleeding through a hose
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Air is let through the regulator
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Air compressor operation
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Mask breathing
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Steam
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Air release with a loud whistling creak,
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Suction action of air
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Soccer ball
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Air compressor, air bleed, cylinder pressure
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Construction, compressor discharges air
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Rope torsion
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Wind tunnel ventilation
★★★★★