And the system has brought our army the independent security in the landing of russian pattern fighters , with a great military and economic benefit 该系统的研制成功实现了我国俄式战机进场着陆的自主保障，具有重大的军事意义和经济效益。
They have to put a lot of heavy metal iron chains around their bodies so that they can control and balance their take - offs and landings . thats what they do 他们要在身上绑很多很重的铁炼，才能平衡重量，起飞和着陆的时候才容易控制，真的就是这样。
U have given me the courage to be all that i can , and i truly feel your heart will lead u back to me when you ' re ready to land 你已破茧而出,所以,展开翅膀准备飞吧,不顾一切地飞向你的太阳(理想) 。当你决定着陆的时候,你会看到我还在原地等你。所以,放心飞吧,我的(小)蝴蝶。
Because of excellent weather conditions and extremely strong signals , venusian scientists were able to get valuable information as to the feasibility of a manned flying saucer landing on earth 由于天气条件极为有利，信号极为清晰，金星科学家们从而获得了有关载人飞碟能否在地球上着陆的宝贵资料。
Gliding descent in autorotation is a maneuver used by helicopter pilots in case of engine failure . it requires considerable skill , and since it is seldom practiced , it is considered quite dangerous 当直升机的发动机失效后，自转下滑就成为驾驶员实现安全着陆的唯一有效手段，这需要熟练的驾驶技术。
Walt disney world ' s newest attraction cost 0 million to build and delivers a remarkable simulation of a rocket launch and spacecraft landing , right down to the nausea and brief moment of weightlessness 沃尔特?迪斯尼乐园新近推出了耗资一亿美元的娱乐项目，出色模仿了火箭发射和宇宙飞船着陆的过程，让游客切实体会到晕船和短暂失重的感觉。
From the simulation , we can get some parameter curves of landing gear . by analyzing these curves and the methods with two - masses model , the linear state equation of landing gear during landing process was established 基于参数曲线分析和二质量模型建立了起落架着陆的线性状态方程,应用现代控制理论对方程进行分析并结合matlab软件对其进行着陆动态仿真。
The strength pressed on the uav is analyzed and a nonlinear modal of uav in ground motion is established in this article . flight simulations have been done in various stages of taking off and landing of uav and in the condition that the ground and the wind power perturbation are exerted 本文进行了详细的分析,得到了无人机在这一阶段的全量非线性方程,并针对无人机的起飞和着陆的全过程在施加地面和风力扰动的情况下进行了仿真。
Recently , with the development of gps , many researchers pay attention to the aircraft ' s precise entrance and landing through gps carrier phase measurement . the key technology of aircraft ' s precise entrance and landing is gps carrier phase integer ambiguity resolution on the fly 近年来，随着gps的发展和完善，利用gps载波相位观测量实现飞机的精密进场与着陆的研究，开始受到人们的关注，而载波相位整周模糊度的动态确定是其中的关键技术。
At last , the researchers discussed and analyzed the results of the simulation contrastively . firstly , according to the conditions of the aircraft being researched , differential coefficient equations of the aircraft during its symmetric landing are established systemically in this paper 文章的主要内容包括:以某多轮多支柱飞机的起落架为例,依据该起落对称着陆的实际情况,系统地建立了该飞机的全机着陆动力模型以及飞机主起落架数学模型。
