Each LLD provides the interface to the particular underlying hardware but USES the standard set of interfaces to the mid layer.
每个LLD都提供了到特定底层硬件的接口，但所使用的到中间层的接口却是一组标准接口。
Each LLD provides the interface to the particular underlying hardware but USES the standard set of interfaces to the mid layer.
每个LLD都提供了到特定底层硬件的接口，但所使用的到中间层的接口却是一组标准接口。
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