This is because the current the electrodes detect is weak, and a really good contact needs to be made between apparatus and skin.

这是由于电极要探测的电流非常弱，仪器与皮肤需要非常好的接触。

youdao

The coils in the scanning apparatus detect these magnetic changes, which are used to build up a map of the part of the body being examined.

扫描仪上的线圈探测到这些磁场变化，并以此构建出患者受检部位的图谱。

youdao

Plate is used to detect or crossed the plane workpiece reference apparatus.

平板是用于工件检测或划线的平面基准器具。

youdao

He was the first to satisfactorily demonstrate the existence of electromagnetic waves by building an apparatus to produce and detect radio waves.

UNESCO: Some important dates for radio