The time from 9, 000 to 5, 000 BC is called the Holocene Climate Optimum, which makes it sound like a nice afternoon on a Mediterranean beach.
公元前9000年到5000年这段时期被称为全新世气候暖期(Holocene Climate Optimum)，这种气候就像地中海海滨的温暖午后一样惬意。
The Holocene Epoch is characterized by different sediments, ones that form when the climate is warmer.
全新世时期的特征为不同的沉积物，它们在气候变暖时形成。
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。
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