The literature of a period reflects its values and tastes. 某一时期的文学可反映出该时期的价值观念和审美观念。
The magnitude of an earthquake is determined from the logarithm of the amplitude of waves recorded on a seismogram at a certain period. 地震级别是根据某一时期震动图记录的地震波振幅的对数值计算的。