The combination pattern of initial gas distributor and secondary gas distributing tray is put forward and its application example in large column was enumerated.

提出了进气初始分布器与二次气体分布盘的组合模式，并列举了组合模式在大型塔中的应用实例。

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The exploration of the secondary gas reservoirs will be in upper Yangtze area while the exploration of the regenerated reservoirs in middle and lower Yangtze area.

上扬子地区主要考虑次生气藏的勘探，中、下扬子地区主要考虑再生烃油气藏的勘探。

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During the formation of the primary condensate gas pool there is no phase change in the pool. But the secondary gas condensate pool was formed by solution of light oil in gas in the pool.

次生凝析气藏是圈闭中轻质油溶解于天然气中形成的凝析气藏，成藏过程中流体相态发生了变化。

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A secondary benefit is getting gas-guzzling old clunkers off the road and replaced with more fuel-efficient band new models.

VOA: standard.2009.05.18

Moreover, many parents of primary or secondary school students find in-person tutoring to be inconvenient, costly (especially at the gas pump), and lacking in quality selection, especially compared to the wider range of tutors found online.

FORBES: Can Online Tutoring Reverse America's Academic Decline?