超声耦合剂；透声媒质；卫生要求；生物学评价。
Ultrasonic coupling agent; Acoustic transmission medium; Health requirements; Biological evaluation.
目的研究凹球面超声换能器的声焦域在高声强和媒质有较大衰减情况下，其形状和几何位置的变化。
Objective the variations of the site and shape of focal region for a concave spherical ultrasound transducer in the case of high sound intensity and stronger attenuation were studied.
揭示了液体媒质中的雷诺切应力是电机声流场的驱动力。
It is revealed that the shearing Reynolds' stress in the fluid is the driving force of the fluid flow.
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