Series a includes steam service for warming up before the main line is opened, and for balancing pressure where the lines are of limited volume.

系列a包括用于在主管道开启前进行加温的蒸汽应用场合，或在流量有限的管道上平衡压力。

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The reliable working of balancing pressure pneumatic controlling doors lies on the driving effect of its link machine, so the rational parameters of link machine need to be designed.

矿用气控无压风门的可靠运行取决于连杆机构的受力传动效果，因此有必要对连杆机构的参数进行合理地设计。

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Maybe they're trying to find a balancing point psychologically, to put some pressure on plaintiff, whatever they're trying to do, we are prepared to deal with it.

也许他们正在试图找到一个平衡点，给原告压力，不管他们正在做什么，我们准备对付它。

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Branding breastfeeding as natural and economical without fully acknowledging the difficulties of balancing family and career creates unnecessary pressure and guilt.

CNN: Breastfeeding is intuitive and easy? No!

Tony Tyler, IATA's director general and CEO, argues that the industry is "balancing on a knife edge" with even the sturdiest and more established airlines feeling the pressure.

CNN: Europe's airline industry on 'knife edge,' says IATA boss

India in particular faces an increasingly untenable balancing act in maintaining its current accommodation of the junta, and will be under growing pressure this year to move toward a policy that better aligns its values and interests.

WSJ: Kelley Currie: India Can Move the Needle on Burma