Oil is the vital lifeline of the national economy in many middle eastern countries.
石油是许多中东国家国民经济的主要命脉。
Water is primary condition of the human survival and lifeline of the national economy.
水是人类生存的基本条件，又是国民经济的生命线。
Meanwhile, they were located in the traffic arteries and were the lifeline of national economy. So their reliability and the ultimate bearing-load capacity are quite important in service period.
同时地处交通要道，交通流量大，是国民经济的命脉，因此它们施工阶段及服役期间的可靠性及极限承载能力至关重要。
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