It is the device mapper's job to map these names correctly to the physical devices.

设备映射器的作用就是将这些名称正确地映射到物理设备。

youdao

The reason for the additional LUN is that the root file system is in use at this time and DMMP cannot add it to the device map; therefore, you cannot get that name for the root partition.

添加lun的原因是，使用的根文件系统和DMMP无法将它添加到设备映射；因此，无法对根分区应用该名称。

youdao

In some cases, you can also map a file descriptor to a plain file or another device into memory.

在某些情况下，还可以把一般文件或另一个设备的文件描述符映射到内存。

youdao

Nevertheless, some iPad users are employing the tablet like a portable navigation device (PND) to map out routes while they are sailing, hiking and driving.

FORBES

An onboard system carries the map in your device.

CNN: Why your trusty GPS sometimes fails you

For the life of the product, users can download four or more full updates of the map on the device every year, which includes all updates to the road network, addresses and Points of Interest.

ENGADGET: TomTom Rider motorcycle GPS gets refresh, for those born to be guided