求翻译：（3）控制变量：行业（IND）：不同行业之间的公司，会由于行业特征的不同，指标差异也大相径庭，控制住同一行业内的样本比较，得来的结论的可靠性也将大幅增加。是什么意思？

(3) control variables: industry (ind,): between companies in different industries, due to the different industry characteristics, indexes were also quite different, controlling the sample within the same industry, the reliability of conclusions obtained will also significantly increase .

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(3) the control variable: industry (IND): between industry companies, because of the different features, index differences are quite different, controlled comparison of samples within the same industry, reliability of the conclusions obtained will be considerably increased.