研究表明，济阳坳陷从沙四段至东营组沉积时期经过了两个气候变化周期。
The study shows that two climate cycles underwent from the sedimentary period of Shahejie Formation to that of Dongying Formation.
传统化学气相沉积(CVD)工艺制备周期长，而且成本高。
The conventional preparing method -chemical vapor deposition (CVD) need a long period and expensive cost.
某一沉积事件周期性出现的频繁程度可用时间序列中的频率来表示。
The periodic occurrence of any sedimentary event may be expressed by the frequency in the time series.
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