对于TUP/ISUP,业务方向又称为中继群. （业务方向：业务方向是两个业务实体之间具有事务处理关系的逻辑连接，业务方向可以根据业务实体的区域划分来区分区域之间的业务方向。）
这些编码是四次群最大似然可译分布空时编码，并且功率在中继之间随时间均匀分布。
These codes are four-group ML decodable and have uniform distribution of power among the relays as well as in time.
根据他们的模型，每个皮质细胞都会连上两群视丘细胞，后者是视网膜讯号传到皮质的中继站。
According to their model, each cortical cell wires up to two groups of thalamic cells, which act as relays for retinal signals bound for the cortex.
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