| 摘要 |
A velocity relevant to a body may be accurately measured using sound waves. Such velocity relevant to a body may be airspeed, i.e., the velocity of the body with respect to the surrounding air, or the velocity of air in the vicinity of the body or along its desired travel path. More specifically, the speed of two or more sounds may be correlated so that an airspeed, or the velocity of air, may be determined by taking into account the fact that sound traveling in the same direction as airflow travels faster than sound traveling in the direction opposite to airflow.
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