露天开采(strip mining)很有效率，但会给大地留下伤疤，而且加工铝土的过程会释放有毒污染物，如果没有适当的控制，这些污染物会渗入水中。
Strip mining is efficient, but scars the land and bauxite processing releases a toxic red sludge that can seep into water supplies if not adequately contained.
介绍了用镗滚压复合加工技术修复液压缸筒的过程，此法修复缸筒质量稳定，生产效率高。
This paper introduces the process of repairing hydraulic cylinder by using boring and rolling combined working technology, working quantity is steady and production efficiency is high in this method.
对加工过程中的几个关键难题，提出了解决办法，为进一步提高加工效率提出了建议。
Solving method of several key problems during machining are set forth, recommendation for further improving machining efficiency is put forward.
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