There was a decreasing trend in each pollutant concentration with rainfall duration and finally tends to flat. So we collect the rainwater after abandoning part of the initial flow of rainwater.
并且各污染物浓度均随降雨历时呈减少趋势，后趋于平缓，可采用弃流部分初期雨水后进行收集。
There were 17 disasters showed a decreasing trend and 9 disasters showed an increasing trend among all of 26 disasters. However, it was not meant that climate change benefited to agriculture.
分析显示，在26种农业气象灾害中，有17种呈减少趋势，有9种呈增加趋势，但并不意味着气候变化对农业有利。
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