The faster an object moves， the slower its time is， compared to the time of a slower moving object.
物体运动越快，其时间越慢(与运动较慢的物体相比而言)。
But to get a high resolution image always need a long exposure time, if the object we want to take is moving at the exposure time, we get a motion-blurred image.
但获取高分辨率的图像往往需要较长的曝光时间，如果在曝光过程中被摄物与航天相机之间存在相对运动。
In the wireless communication, as a result of the object moving or other reasons, the channel is time-varying.
无线通信中，由于物体的运动或其他原因，信道是时变的。
In the wireless communication, as a result of the object moving or other reasons, the channel is time-varying.
无线通信中，由于物体的运动或其他原因，信道是时变的。
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