three-point landing

The low-energy lunar landing trajectory design using the invariant manifolds of restricted three body problem is studied.

研究了基于三体问题的不变流形设计低成本登月轨道的问题。

The three will fly to Beijing after taking physical examinations in ambulance helicopters at the landing site.

三人将在身体检查之后，在着陆地点搭乘医疗直升机飞往北京。

Before the three-point landing gear wheel.

前三点轮式起落架.

A three-dimensional rigid body model is used to study the landing of a helicopter in autorotation.

首先，建立了一个描述直升机自转着陆飞行动力学特性的三维刚性体模型。

Finally, the three-dimensional display system has been designed for show the flight state of UAV in taking off and landing stage.

最后，为了在仿真系统中更好地显示无人机的起飞或着陆状态，设计了三维显示系统。

For the next three days the CIA planners canvassed alternative landing sites.

在会后的三天里，中央情报局的策划者们仔细地研究了可供选择的登陆地点。