They like to measure the coming and the going of the speed of objects so they will have red shift or blue shift to know if objects are advancing or retreating from the observer.
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释义
他们喜欢测量目标进入和离开的速度,那么他们能得到红移或蓝移量,然后得知目标对于观察者而言是正在前进还是后退。
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