A string of incidents related to Soyuz has raised concerns. Problems during a landing in April 2008 resulted in a dangerously steep re-entry trajectory.
联盟号飞船发生的一系列事故也让人感到担心。2008年四月着陆期间发生的问题导致它出现重返地球时的险情。
The technology of hole trajectory primary sect ion is the key of drilling in re entry horizontal Wells.
侧钻水平井轨迹起始段工艺技术，是侧钻水平井钻井工艺的关键技术。
A new method based on multi-model prediction is proposed for the longitudinal guidance of re-entry vehicles with trajectory and control constraints.
在具有控制和轨迹约束的再入制导中，提出了一种新的基于多模型预测再入飞行器纵向制导方法。
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