Barely Significant

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13 and 14 ; Table 4 are as follows: Under the condition of the same pressure difference in gas migration between the inlet and outlet of REV, the gas migration pressure shows a decreasing trend during the migration process along the pores and fissures connected channel, that is, the red color at the inlet gradually evolves towards the blue color at the outlet.
Beijing and Shanghai concentrate on the advancement of the tertiary industry, whereas the contribution of the primary industry (encompassing agriculture, forestry, animal husbandry, and fishery) to the total economic output is relatively minor and has exhibited a decreasing trend in recent years, setting them apart from other provinces in China.