求翻译：移动平均法是根据历史时间序列资料逐项推移，依次计算包含一定项数的序时平均数，以反映长期趋势的方法。当时间序列的数值受到周期变动和不规则变动的影响，起伏较大，不易显示出发展趋势时，可用移动平均法消除这些因素的影响，分析、预测序列的长期趋势。是什么意思？

Moving average is based on the historical time-series data, in turn, a case-by-case basis, calculated over a certain number of items ordered, average to reflect long-term trends. When the time sequence of the value changes by cycle and the impact irregular changes, ups and downs, and is not a large

Moving average is based on the historical time series data over item-by-item, calculated average number sequence that contains a certain number of items in order to reflect the long-term trend. When time to sequence numerical effect and irregular movements of the cycle changes, fluctuation is large,