However, in city, especially in small towns, there are still serious technical barriers in the field of natural gas supply.
但是，城镇尤其是小城镇的天然气供应问题还存在着重要的技术障碍。
However, in city, especially in small towns, there are still serious technical barriers in the field of natural gas supply.
但是，城镇尤其是小城镇的天然气供应问题还存在着重要的技术障碍。
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