Main idea of ditch grouping and channeldivision, rotors arrangement and the position of influent and effluent are explained in the engineering layout aspect.
在工程布置中说明氧化沟分组与分槽、转刷配置、进出水位置等布置要点；
2
OFDMA is based on the idea of frequency-division multiplexing, which is a method to transmit multiple data streams over a channel.
OFDMA是根据频分多路传输系统的思想，这是一种在一个频道上传输多个数据流的方法。
3
LTE splits the channel into two parts using frequency-division multiplexing, so the download and upload speeds are better balanced.