However, at lower discount rate and heavy traffic flow the initial cost of construction is in essence irrelevant.
然而，在折限率较低与交通量大的情况下，从本质上讲，与建设的最初成本没有关系。
The successful experience and the initial knowledge were summarized, and it will be benefit for further simplifying well bore construction, cutting cost and raising working efficiency.
总结出一套使用套管钻井的成功经验和初步认识，对今后在我国海洋钻井作业中进一步简化井身结构、降低成本、提高效率，具有十分重要的指导意义。
Compared to the initial cost of construction, ensuring clean water is much quicker and a more realistic project.
比起消耗更大的电力工作来说，能够更快起作用的清洁水保障工作更加实际。
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