但是，基建投资和运行费用给污水厂的建设和运行带来了巨大的经济压力。
But infrastructure investment and operation cost has brought huge economic pressure on the construction and operation of sewage plants.
同时，从工艺技术、征地、基建投资、运行费用等技术经济方面分别对可行的矿石和废石运输系统进行了详细的比较。
At the same time, the feasible ore and rock haulage systems are, in detail, compared in respects of technological process, land requisition, capital investment, operation cost, etc.
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