abrupt change test的用法和样例：
- Based on the 51-year annual precipitation data of Ningbo from 1953 to 2003,a detailed analysis is performed by means of several diagnosis methods,including EOF,climatic abrupt change testing,Mexico hat wavelet and spectrum analysis.
- He keeps grumbling at the abrupt change of weather.
- Many people caught cold in an abrupt change in the weather.
- An abrupt change of image or sound, as between shots in a film.
- His abrupt change of subject left her floundering helplessly.