Astronauts look weightless because they are in continuous freefall towards the Earth, staying aloft because of their horizontal motion.
宇航员表明上看起来是失重的，那是因为他们在不停地往地球方向做自由落体运动，而他们在水平方向上的运动又使他们保持着漂浮的状态。
Skylifter plans to use several such drives to control the craft's horizontal motion and to aid a buoyancy-control system within the envelope in moving the vehicle up and down.
Skylifter计划使用数个上述装置来控制飞行器的水平运动，并在表膜层内置浮力控制系统来调节垂直升降。
Skylifter plans to use several such drives to control the craft’s horizontal motion, and also to aid a buoyancy-control system within the envelope in moving the vehicle up and down.
Skylifter计划使用若干这种驱动器来控制飞船的水平运动，同时也辅助安装在气球内部的浮力控制系统操纵飞艇的升降。
As you learn to accelerate the horizontal motion, jumps will immediately become easier.
当你学会如何快速进行横向移动时，大跳练习对你来说将会易如反掌。
Multiple tuned mass dampers (MTMD) are developed mainly for the purpose of suppressing horizontal motion of structures and buffeting of bridge structures.
多重调谐质量阻尼器(MTMD)主要被用来控制结构的侧向振动与大跨桥梁的抖振。
The load sway of crane is mainly generated by its horizontal motion.
起重机载荷摆振主要是由载荷水平运动引起的。
On the equator the deflection force of earth rotation which acts on the objects in non horizontal motion is not equal to zero.
赤道上作非水平面内运动的物体所受的地转偏向力并不等于零。
In general, the flexural resonance occurs when the frequency of horizontal motion of the gate approaches the natural frequency of the cable.
通常当闸门的水平摆动频率接近索的固有频率时，将产生横向共振。
The research on the dynamic behaviors of the coupling system under different external excitations of horizontal motion has been carried out in the second part.
第二部分是关于贮箱类流固耦合系统在平动激励作用下动力学问题的研究。
The drifting problem emerged when solving the horizontal motion responses of a ship traveling in the oblique waves in the time domain, which used to annoy the engineers for many years.
在采用时域方法求解斜浪中船舶的水平运动响应时，计算中出现的横向“漂移”现象一直是困扰工程师们的难点。
An intelligent model for a ship's horizontal motion, which can self-adapt with navigating speed, ocean condition and course, was established based on the Radial Basis Function (RBF) neural network.
以某水面舰艇为研究对象，利用径向基函数神经网络算法和标况下的水池实验数据，建立了基于航速、航向角和海情自适应变化的船舶横向运动非线性参数模型。
An intelligent model for a ship's horizontal motion, which can self-adapt with navigating speed, ocean condition and course, was established based on the Radial Basis Function (RBF) neural network.
以某水面舰艇为研究对象，利用径向基函数神经网络算法和标况下的水池实验数据，建立了基于航速、航向角和海情自适应变化的船舶横向运动非线性参数模型。
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