A channel is a 32-bit area which can be written to or read from (but not both — they are unidirectional) using special instructions.
信道是一个32位的区域，通过使用特殊指令可被重写或读取(但不可能二者兼备——它们是无方向的)。
Single channel fiber optic rotary joint has simple structure, small size and low optical losses, but the unidirectional transmission limits its wide applications.
单通道光纤旋转连接器具有结构简单、重量轻和耦合损耗小的优点，但传输信号单一，不能双向传输的缺点限制了它的广泛应用。
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