To consider the effect of the earth on the calculation of ultra range trajectory more accurately, an elliptic earth trajectory model adopting accurate normal gravity is established.

为了更精确地考虑地球对超远程弹道计算的影响，提出了一个计入精确正常重力的椭球地表弹道模型。

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A novel rapid method to design optimal-fuel interplanetary trajectory for low-thrust propulsion is presented based on normal trajectory approach.

针对星际探测任务中燃料最省小推力转移轨道问题，提出一种基于标称轨道的快速设计方法。

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Keynesian economists argue that the correct policy response is to boost government spending (G) through fiscal stimulus, allowing consumers and businesses time to adjust and recover, and to gradually remove that stimulus as the economy returns to its normal growth trajectory.

FORBES: Impossible Things And Our Economic Recovery