pulse width keyer

例句：

1. 1. The device measures the pulse width of a heartbeat to diagnose heart disease.
   该设备通过测量心跳的脉冲宽度来诊断心脏病。
2. 2. In medicine, pulse width is used to monitor blood pressure and heart rate.
   在医学中，脉冲宽度用于监测血压和心率。
3. 3. The pulse width keyer is an essential tool for monitoring the health of the heart.
   脉搏宽度键是监测心脏健康的重要工具。