If there is very little air at very high altitudes , what will give the wings enough force to hold airplane up 如果在非常高的高度几乎没有空气的话,那么是什么将给机翼足够的力把飞机托起呢?
There are three important subjects in future uav system development direction . they are very high altitude , long - duration , multifunction and network - based operation 高高空、长航时、多功能和网络化是未来无人机系统发展的方向。
Multi - redundancy and multi - sensor self - determination ( passive ) fault - tolerance technologies are emphases in long - duration very high altitude uav navigation system research 网络化多余度、多传感器自主(无源)容错导航技术是长航时无人机导航技术研究的重点。
In india today , many people are still practicing in seclusion high in the himalayas . there are some places in very high altitudes that are extremely cold where humans have never set foot . these people come down only once a month or rely on food brought by other people 在印度,现在在喜马拉雅山上面,也还有很多人躲起来修行,有一些地方,从来没有人的脚步,好冷好高,他们一个月下去一次,或是有人拿上来一些米饭食物给他们吃,他们在那里认真修行,不下山。