可以直接在外部的内存设备(SD卡)上安装应用，还可以将应用从内部迁移到SD卡上，反之亦然。

Apps can be installed directly on an external memory device (SD card). They can also be move from internal memory to the SD card and back.

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吊顶内部设备、管道的安装、检修空间不够。

Space for equipment and pipes in the ceiling is not sufficient for installation and maintenance.

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目前这些设备中许多都具有与外部天线相对的内部天线，其安装在设备外壳内。

Many of these devices now have internal antennas which in contrast to external antennas, are installed within the housing of the devices.

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