This text introduced the practice method of the box permanent steel petroleum derrick shaft sinking in the construction of vertical shaft pit shaft.

在立井井筒建设中，我们在原设计的基础上，对箱形永久钢井架凿井的实际方法作了改进。

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Based on theory and practice, a number of problems in the process of calcining clinker in vertical cement kiln was analysed.

根据理论和实践总结分析了立窑煅烧水泥熟料工艺过程中存在的问题。

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But the spacecraft preparation facilities at the CSG are set up to do it in the vertical, and so the new gantry has been developed to fit with European custom and practice.

BBC: A rocket abroad - Soyuz in French Guiana