So many air compressor units can greatly reduce the operation cost.
故多空压机机组可大大节省运行费用。
Adopting transportation discount can save the transportation cost, and reduce the operation cost.
提供运输折扣可以节省运输费用，减少运营成本。
It is wrong that some users want to reduce the operation cost through reducing the flow rate of sand.
有些用户想要通过降低砂料流速降低运行成本，这是错误的。
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