Construction on the south section of the China-Russia east-route natural gas pipeline started on Tuesday, marking new progress in the two countries' energy cooperation to improve the capacity of natural gas supply in the Yangtze River Delta. Covering 5,111 kilometers, the Chinese part of the east route pipeline passes through nine provincial-level regions from Heilongjiang Province in the north to Shanghai in the east. The key part of the construction of the south section is to build a underwater tunnel t
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