旅游者购买耐用消费品除了要承担较大的经济成本之外，还要克服较大的心理阻力，承担较大的心理成本。
Apart from the biggish economic cost, tourists have to conquer psychological resistance and assume biggish psychological cost in purchasing of durable consumable.
而注表面活性剂和聚合物的复配体系段塞后热水驱虽然提高采收率幅度较大，但吨油新增成本较高，经济上不合理。
The surfactant and polymer mixed system slug is well on recovery ratio but the additional cost of ton oil is higher, economic benefit is not satisfactory.
此法成本低， 机床精度高， 具有较大的社会效益和经济效益。
This method has many advantages such as low cost, high accuracy and huge social and economic benefits.
另外所用溶剂可回收循环利用，降低生产成本，具有较大的实施价值和经济效益。
In addition, the solvent can be recycled so as to reduce the production cost and has higher implementation benefit and economic benefit.
以较小的成本获得较大的盈利是经济学的精髓。
The essence of economics is to get the maximum profit with the lowest costs.
试验表明：用挤压铸造工艺取代原有的旧工艺可明显提高制品性能，降低成本，提高生产率，具有明显的经济效益和较大的推广价值。
It shows that the die casting method instead of the old gravity casting method has many advantages such as improving the properties, reducing the cost and increasing the productivity.
试验表明：用挤压铸造工艺取代原有的旧工艺可明显提高制品性能，降低成本，提高生产率，具有明显的经济效益和较大的推广价值。
It shows that the die casting method instead of the old gravity casting method has many advantages such as improving the properties, reducing the cost and increasing the productivity.
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