wet period meaning in Chinese

湿润周期

The late 1940s - early 1960s and early 1970s to middle 1980s is wet period . the early 1960s to early 1970s is dry period . the significant decrease of rainfall began in the 1990s
40年代末至60年代初期及70年代初期至80年代中期为多雨期， 60年代初期到70年代初期为少雨期， 90年代初期以后又有明显的下降。
The study on the time series of global land average seasonal precipitation points out that the interannual and interdecadal fluctuations of the rainfall are clear . the late 1940s - late 1960s and the 1980s - 1990s corresponds to wet period and dry period respectively , and the 1970s expresses a apparent interannual variation of rainfall
指出降水有明显的年际和年代际尺度的振荡， 1940s末至1960s末为多雨期， 1980s至今降水多为负距平； 1970s降水的年际变化比较大。