The narrow road outside Beijing's No 55 Middle School is usually crowded just before morning lessons, but this week it was busier than usual.
北京市第55中学外面窄窄的公路通常在早自习前非常拥挤,但是本周比以往更加人潮滚滚。
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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.