In late Holocene, climate is dryer and cooler than that in middle Holocene, the precipitation of drainage area decreases. So runoff deceases, the width of riverbed becomes narrow.
进入全新世晚期，由于气候相对于全新世中期变得较为干燥，也较为温凉，流域来水减少，故流量减小，河床宽度变小。
The soil stores moisture during cooler weather. But most of that moisture is gone by the middle or end of the hottest months of the year.
在天气比较凉爽的时候，土壤会储存水分。但是在一年中最炎热的月份中间或结束时，水分会消失。
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