通过解读文献来分析煤气的生产、净化、储存和传输，以及煤气灯的形制等方面的理论和技术内容。

Through all these literature, the author analyses many important links of the coal gas production, the purification, the storage, the transmission as well as the gas lamp production at that time.

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通过使用主成分因素分析、相关分析等统计技术，笔者对问卷数据进行了逐一解读。

Survey data were analyzed by using a variety of descriptive and inferential statistics, including principal component analysis and correlation analysis.

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