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A Learjet engine nozzle peeks out from NASA Glenns Nozzle Acoustic Test Rig, a cylinder surrounded by tan wedges. The walls of the Aero-Acoustic Propulsion Facility, also covered in wedges, glow blue in the background.

A Learjet engine nozzle peeks out from NASA Glenns Nozzle Acoustic Test Rig, a cylinder surrounded by tan wedges. The walls of the Aero-Acoustic Propulsion Facility, also covered in wedges, glow blue in the background.
A Learjet engine nozzle peeks out from NASA Glenns Nozzle Acoustic Test Rig, a cylinder surrounded by tan wedges. The walls of the Aero-Acoustic Propulsion Facility, also covered in wedges, glow blue in the background. 图：NASA
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