较国内广泛使用的RS485总线构成的通讯网络相比，具有通讯距离远、系统构成成本低的优点。

Compared with domestic general communication network made up of RS485 bus, it has merits of long communication distance and low system cost.

youdao

因为距离远，又缺乏交通工具，山区与外界是隔绝的。 由于通讯工具不足，这种隔绝状态更严重了。

The isolation of the mountain areas because of distance and the lack of transport facilities is compounded by the paucity of the information media.

youdao

由于距离远，又缺乏交通工具，农村社会与外界是隔绝的。而通讯工具的不足则使这种。

The isolation of the rural world because of distance and the lack of tansport facilities is compounded by the paucity of the information media.

youdao