Drought: Australia, Bulgaria, Hungary and the United States reported experiencing several drought episodes of varying intensities during the 20th century, as a result of an overall decrease in mean annual precipitation.
106. 干旱：澳大利亚、保加利亚、匈牙利和美国报告说，由于平均年降水量普遍下降，20世纪发生了几场严重程度不同的干旱。