以实际蒸发蒸腾量、有效降雨量和土壤贮水量来预报未来灌水时间。
It is based on actual evapotranspiration capacity, effective rainfall and water reserve of soil to forecast irrigation time.
这个有效的样例应用程序可以用来比较两个城市的天气数据，具体方法是在Lotus Symphony电子表格图表中以图形的方式显示平均降雨量数据。
This nontrivial sample application can be used to compare climate data for two cities through the visualization of their average rainfall data as graphs in a Lotus Symphony spreadsheet chart.
宁夏的干旱从2004年开始，一些区域没有受到有效性的降雨持续达600天之久。
The drought in Ningxia started in 2004 and some districts have not received substantial rainfall for over 600 days.
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