This is a read-only set of properties that define the device's major and minor device classes and its services.

这是一个只读的属性集合，它定义了设备的主要和次要的设备类以及它的服务。

youdao

This is a read-only set of properties that define the device's major and minor device classes and its services.

这是一个只读的属性集合，它定义了设备的主要和次要的设备类以及它的服务。

youdao