A more serious analysis, however, needs to distinguish between three separate questions.
然而，一个更严肃地分析，需要鉴别三个。
The Bureau of Economic Analysis (BEA) revised its numbers back through the recession, revealing a downturn more serious than previously understood.
美国经济分析局（BEA）更改了经济萧条期间的数据，新数据显示出比预期更为严重的经济萧条。
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