These signals send echoes through the body tissue to the skin where they can be detected by metal sensors and displayed as an electrocardiogram, an electrical readout that allows doctors to constantly monitor the heartbeat.

这些信号通过人体组织将回声发送到皮肤，在那里它们可以被金属传感器检测到并显示为心电图，这是一种让医生持续监测心跳的电子读数器。