通过测量夜光云反射的光的变化，他们发现夜光云从盛到衰的周期大约为27天。
By measuring changes in the light reflected from the clouds, they found that the clouds appear to wax and wane in prevalence over a 27-day cycle.
通过测量夜光云反射的光的变化，他们发现夜光云从盛到衰的周期大约为27天。
By measuring changes in the light reflected from the clouds, they found that the clouds appear to wax and wane in prevalence over a 27-day cycle.
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