But problem is that production brings not only private return to enterprise but also negative externalities to society, both of which affect the increase of social welfare.

但是，企业的生产不仅产生企业私人收益而且也可能带来外部不经济，这些都会影响社会福利的增长。

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Improve the reliability of the machine for production, avoid unnecessarily increase of the cost of maintenance and affect the normal production.

提高机器的可靠性，避免为生产增加不必要的维修费用和影响正常生产。

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With the mining depth increase in Yaoqiao Coal mine in Datun mine area, various nonlinear mechanics damages are appeared, which can seriously affect the safety production.

大屯矿区姚桥煤矿进入深部开采后，出现各类非线性力学破坏现象，严重影响巷道的正常使用。

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