介绍了液化天然气（LNG）作为城市气源在我国的利用情况，并介绍了液化天然气的运输、储存、气化技术。
The utilization of LNG as city gas in China is introduced, and LNG transportation, storage and vaporization are also discussed in detail.
但是，不断增长的用气需求与城市气源总量和调峰能力不足的矛盾，还是给城市天然气战略安全提出了严峻的考验。
However, the contradiction between the growing gas demand and the shortage in the total amount of city gas supply and load capacity, poses a severe test to the urban natural gas strategic security.
但是，不断增长的用气需求与城市气源总量和调峰能力不足的矛盾，还是给城市天然气战略安全提出了严峻的考验。
However, the growing gas demand, total amount of city gas supply shortage and load capacity of the contradiction, which poses a severe test to the urban natural gas strategic security.
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