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.
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