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Bowling. Bowling pins in a row. Skittles and balls on a white background. For designs team sports and outdoor activity themes.
Young boy plays on drum kit at home. Elderly man irritated by noisy neighbor, screams, knocks on the wall. Low level of sound insulation. Apartments separated by wall. Neighbourhood concept.
Knock sensor. Replacing broken engine knock sensor, engine detonation. Bad knock sensor and new one ready to replace. Faulty knock sensor, engine problems. Car maintenance. Selective focus
golden door knocker
The man knocks very loudly on the door with his fists. A young visitor is dangerous or aggressive, asking to enter the house or office.

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