The physical layer consists of the actual disk.
物理层由实际的磁盘组成。
To achieve this, keep the database/physical layer as clean as possible.
要达到这一目的，需要尽量保持数据库/物理层的简洁。
Have their own simulation of the physical layer.
还有自己模拟的物理层。
So, it is necessary to study key technologies of physical layer of optical network.
因此有必要对光网络物理底层关键技术进行研究。
So, it is necessary to study key technologies of physical layer of optical network.
因此有必要对光网络物理底层关键技术进行研究。
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