B. External fetal monitoring. The FHR is measured by focusing an ultrasound beam on the fetal heart. The fetal monitor interprets Doppler signals.

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。

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One of the main methods of fetal monitoring is monitoring the fetal heart rate (FHR), and the method based on Ultrasonic Doppler effect is a effective method without wound to detect the FHR.

监听胎儿心率是胎儿监护的主要方法之一，基于超声多普勒效应的胎心率检测法是一种有效的无创方法。

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A. electronic fetal monitoring. The electronic fetal monitor determines the FHR and continuously records it in graphical form.

电子胎儿监护。电子胎儿监护反映胎心率并以图形衔式连续记录。

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