短语词组短语loop buffer 循环缓冲器loop buffer length 环缓冲区长度;循环缓冲区长度loop buffer storage 环形缓冲区loop - buffer 环形缓冲区loop data buffer 环形数据缓冲区dual -loop optical buffer 双环耦合全光缓存器;双环结构缓存器 返回 buffer loop