All panes beginning with AL0 are the topmost parents in the first level of the navigation.
所有以al0开头的窗格都是第一级导航中的最高父级。
Depending on the direction of the navigation, the focus returns to the first or the last item when the end or the beginning of the container is reached.
根据导航方向，当到达容器的末尾或开始位置时，焦点将返回到第一项或最后一项。
Based on proportional navigation which is popularly used, target maneuver and guidance command is analyzed, and one design method of beginning time of reaction-jet is proposed.
文中基于广泛应用的比例导引律，对目标机动与导引指令信号进行分析，提出了一种直接力引入时机的设计方法。
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