Because of their narrow bandwidth, CF signals portray only the target's presence and, in the case of some bat species, its motion relative to the bat's.
因为它们的频宽很窄，CF信号只能描绘目标的存在，而对于一些种类的蝙蝠来说，CF 信号还能描述目标相对于蝙蝠的运动。
But the earth is in motion relative to the sun, the sun is in motion relative to some other star, and so on.
但地球相对于太阳运动，太阳相对于某些其他恒星运动，等等。
In relativity, your observations must always be with respect to a particular observer-an observer with a well-defined motion relative to whatever is being observed.
在相对论里面，你的观察总是必须会涉及到一个特定的观察者-一个相对于被观察物有着明确的相对运动的观察者。
Further topics include kinematics, particle dynamics, motion relative to accelerated reference frames, work and energy, impulse and momentum, systems of particles and rigid body dynamics.
更进一步探讨运动学，质点动力学，于加速座标系上之运动行为，功，能量，冲量，动量和质点系统与刚体动力学。
The actuators are propelled or otherwise capable of motion, relative to each other so that the distance between can be increased or decreased.
所述致动器被推进或以其他方式能够相对于彼此运动，使得之间的距离可增大或减小。
The actuators are propelled or otherwise capable of motion, relative to each other so that the distance between can be increased or decreased.
所述致动器被推进或以其他方式能够相对于彼此运动，使得之间的距离可增大或减小。
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