NextGen will allow planes to make what is called a continuous-descent approach (CDA), essentially letting them turn off their engines, saving tons of fuel and reducing pollutants.

次世代可允许飞机采取被称国持续降落进场（CDA）的动作，从而事实上关闭引擎，节约燃料，减少污染物排放。

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In addition, the nitrogen rich gas is used for fuel tank pressurization during descent.

另外，在飞机降落过程中，富氮气体还可用于。

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Furthermore, an attainable set for initial conditions of the gravity-turn descent is deduced according to the constraints of thrust, fuel and states of the soft landing system.

此外，根据软着陆系统推力、燃料和状态的约束条件，给出了引力转弯着陆过程初始条件的可达集合。

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