Based on the data of a longterm field experiment of dryland crops, this article points out that yield fluctuation, expressed in fluctuating coefficient, is a regular phenomenon in dryland farming.
Next, this paper gives a description and demonstration of long-term trend and short-term fluctuation of China's monetary velocity.
其次，本文对我国货币流通速度的长期趋势和短期波动现象进行描述与论证。
3
The previous study of fluctuation of economic growth is limited to fluctuation of long-term economic growth and its research methods mainly use statistical knowledge.