The classification strategy and implementing algorithm is given in this paper, and the method's validity is proved by the subject information classification of China oil and gas pipeline.
文中给出了分类策略和实现算法，并以中国石油网油气管道专题信息分类为例验证了方法的有效性。
The China-Russia crude oil pipeline project kicked off smoothly and both sides entered into new consensus in such fields as nuclear energy, power and natural gas.
中俄原油管道项目顺利启动，双方在核能、电力、天然气等能源领域达成新的共识。
China-Russia oil pipeline has been formally put into operation and the bilateral cooperation in the energy fields of coal, natural gas and electricity moves forward steadily.
中俄原油管道正式投产运营，煤炭、天然气、电力等能源合作进展顺利。
The oil and gas pipelines have the history of nearly 50 years in China, and pipeline design life is generally about 30 years.
我国油气管道距今已有近50年的历史，而管道的设计寿命一般在30年左右，故我国许多埋地输气管道已进入事故多发期。
The Second West-East gas pipeline, when completed, will be connected to more than ten established pipelines in China, and will be a backbone of guarantee in China's oil and gas pipeline system.
西气东输二线全线建成后，将与中国十几条已建成管道相连，在中国油气管网体系中发挥骨干管线的保障作用。
The Second West-East gas pipeline, when completed, will be connected to more than ten established pipelines in China, and will be a backbone of guarantee in China's oil and gas pipeline system.
西气东输二线全线建成后，将与中国十几条已建成管道相连，在中国油气管网体系中发挥骨干管线的保障作用。
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