"Mesosternal" Natural Recordings by Native Speakers
Mesosternal refers to the middle of the sternum, or breastbone, in anatomy.
Mesosternal
The mesosphere is a layer of the Earth's atmosphere that extends from about 50 to 85 kilometers (31 to 53 miles) above the planet's surface. It is the layer above the stratosphere and below the thermosphere. The mesosphere is characterized by a steep temperature decrease with altitude, as well as a relatively low atmospheric pressure. In this layer, the air is very thin and there are few clouds or particles, making it a challenging environment for aircraft to fly.