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汉语拼音：xīn yīn

1.心脏收缩和舒张时发出的声音。收缩时其音低沉而长，舒张时其音清晰而短。心脏发生病变时会有杂音。

1. 心脏收缩和舒张时发出的声音。收缩时其音低沉而长，舒张时其音清晰而短。心脏发生病变时会有杂音。

• The structural defects of a heart are often reflected in the sounds that the heart produces.

  心音的改变和心脏杂音的出现，往往是器质性心脏病的最早体征。

• It also gives a safety design problem analysis using an electret capacitor microphone to pick-up the heart sound signals.

  该电路涉及到放大、滤波、电平抬升等电路，并给出了安全设计问题，利用驻极体电容传声器来拾取心音信号。

• It consists of a phonocardiogram sensor, a heart sound collecting and processing circuit, and a computer.

  该系统由心音传感器、心音信号采集处理电路及计算机组成。

• The results showed that the first heart sound energy fraction were significantly different in the normal group and the heart murmur group.

  试验结果表明，在正常组和返流性心脏杂音组间，第一心音能量分数存在显著性差异。

• Cardiac tamponade is suggested by jugular venous distention, muffled heart sounds, and a paradoxical pulse.

  颈静脉怒张、心音低沉、及奇脉提示心包填塞。

• It's not even a question of attracting people's attention.

  这甚至不是一个心音人们注意力的问题了。

• Since the 1970s, doctors have routinely listened to fetal heartbeats despite no real evidence that it did any good.

  1970年以来，医生们常规听取胎儿心音，尽管没有确凿证据表明这有什么好处。

• Ultrasonics. Hand-held probe doppler foetal heartbeat detectors. Performance requirements and methods of measurement and reporting.

  超声波学.手持探头式多普勒胎儿心音检测器.测量和记录的性能要求和方法

• Results Portable electro-auscultating system was realized, which integrated the functions of watching, monitoring and recording.

  结果：实现了具有“视、听、记”一体化优点的便携式电子心音听诊系统。