一般写法
US Revenue = CALCULATE ( [Revenue], FILTER ( 'Geography', 'Geography'[Area] = "United States" ) )
US Revenue 1 = CALCULATE ( [Revenue], 'Geography'[Area] = "United States" )
最佳写法：
US Revenue 2 = CALCULATE ( [Revenue], KEEPFILTERS ( 'Geography'[Area] = "United States" ) )
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