The special feature of the demonstrator is that the sensing elements have no need of an external power supply.

这种演示装置的特点在于，其传感器件不需要外部电源。

youdao

The special feature of the demonstrator is that the sensing elements have no need of an external power supply.

这种演示装置的特点在于，其传感器件不需要外部电源。

youdao