受技术经济条件限制，我国西部盐湖中蕴藏的大量镁资源至今尚未得到有效利用。

The huge amount of magnesium resource contained in the western salt lakes is not utilized effectively due to the limitation of the technical and economic conditions.

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工作压力是油气管道设计中的一个重要部分，它对管道的技术经济条件影响很大，如何确定它非常重要。

The operating pressure of oil and gas transportation pipelines is a major part in design, which will impact on the tech-economic target and it is very important to determinate it.

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在原燃料和装备水平一定的条件下，合理的操作制度对高炉的技术经济指标起到决定性的作用。

Under certain conditions of raw material and equipment, the reasonable operation system plays an important role in increasing technical and economical index of BF.

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