An English Swallow is a species of bird, not an object typically related to air pressure or velocity. The air pressure and velocity experienced by a bird like the English Swallow would depend on various factors such as the bird's altitude, air temperature, and wind conditions.

Swallows are known for their agility and maneuverability in the air, and they are able to fly at high speeds while navigating through narrow spaces and avoiding obstacles. These abilities are likely related to the air pressure and velocity they experience while in flight, as well as the shape of their wings and the way they move them.

Overall, the study of the aerodynamics of birds and how they are able to fly is a complex and fascinating area of research, and much is still unknown about the mechanisms behind avian flight.
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