第四步：看下面一条程度线，也就是伶俐线。

Step 4: Look at the next horizontal line, which is the head line.

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文中提出了一种生命线工程系统受灾程度的定量分析方法。

The method to analyze the disaster degree of lifeline systems is set up.

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文中提出了一种生命线工程系统受灾程度的定量分析方法。

The method to analyze the disaster degree of lifeline systems is set up.

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