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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And then LLD, we'll see in a moment, this is for particularly long Numbers which will become relevant especially as you're trying to process lots of information.