19考研英語：屠屠長難句（六十二）

1每日一句長難句
The energy used to separate oxygen from air before burning is almost as great as that needed to filter out nitrogen afterwards, leading to a similar loss of efficiency.

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2【結構分析】
本句是一個簡單句，爲一個主系表結構The energy is almost as great as that needed to filter out nitrogen afterwards，使用了as…as…結構。主語energy由過去分詞結構used to separate oxygen from air before burning 作後置定語，比較的對象that needed to filter out nitrogen afterwards中，that指代上文的energy，過去分詞結構needed to…作後置定語。句末的現在分詞結構leading to a similar loss of efficiency作全句的結果狀語。

3【詞彙】
separate...from… 將…分離

filter out 過濾

4【參考譯文】
燃燒前將氧氣從空氣中分離所需的能源幾乎不亞於上述將氮氣過濾所需的耗費，這就使得兩者在效率損失上不相上下。

5【明日長難句】
Some great manufacturers and great service companies may have become too lean in their relentless drive to reduce costs, outsourcing not just their non-core activities but essential ones too.  

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