The model overcomes the unpredictability due to monotonicity and periodical fluctuation of freight volume.
该模型克服了货运量的单调性和周期波动性给预测带来的困难。
Periodical fluctuation in the air influx of column occurs frequently at the adjusting stage during the startup of an air separation unit.
空分设备启动进入调整阶段时，常常会发生进塔空气量周期性波动的现象。
Based on statistics of fire in China in the past years, the characteristics of developing trend and periodical fluctuation are found in fire regularity in China.
分析中国火灾的历年统计数据，发现中国火灾发生规律同时具有增长趋势性和周期波动性特征。
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