随着超声波束与血流角度的减小，检测到速度增加。
The estimated velocity increased with the decrease of Angle between the ultrasonic beam and blood flow.
引导声波束的发射罩形成等离子体禁闭球，将能量包裹在球体中。
The energy is enveloped in a plasma containment sphere shaped by emitter cowls that channel the sonic beam.
外监护。通过集中超声波束于胎儿心脏来描记胎心率，胎儿监护翻译多普勒信号。
B. External fetal monitoring. The FHR is measured by focusing an ultrasound beam on the fetal heart. The fetal monitor interprets Doppler signals.
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