通过控制导航条的状态来跟踪和展示用户当前位置很困难，成本很大时，用它来替代标签。
Use instead of tabs when it would be prohibitively expensive to track and display the current location of the user as a state in the navigation control.
利用基准优化弹道参数和滑模控制思想，构造滑动面，提出了一种新的弹道跟踪制导规律。
Parameter of optimized trajectory and variable structure with sliding modes control theorem are used to construct sliding surface, obtain a new tracking trajectory guidance law.
适当地结合规划-跟踪算法和航迹角控制器可给再入制导带来极大的灵活性和适应性。
Proper combination of planning-tracking algorithm and FPA controller can bring great flexibility and adaptability to reentry guidance.
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