The book I'm reading says there is a slight difference of meaning between these two sentences. I can't really grasp the difference. Do you agree with my book?
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If you look at these two sentences separately out of context, the former refers to the qualities of A without B's diligent spirit and attitude. The latter refers to A's diligence being lower than B's (the underlying implication is that the former is more like A is not diligent and B is diligent, and the latter is more like A than B is not diligent enough). ）