该增长的很大一部分发生在乌鲁克自身，它成为了一个真正的城市中心，被一系列次级定居点环绕。
A large part of that increase took place in Uruk itself, which became a real urban center surrounded by a set of secondary settlements.
那些评估公司很错误的估计了次级房贷的破产率，目前必须将一系列的与这房贷有关的债券进行降级。
Rating agencies badly misjudged default rates in subprime mortgages and are now having to downgrade reams of securities linked to them.
此次信贷危机是一系列的复合危机，它开始于美国的次级贷，逐渐席卷了多种资产类别和其它地区。
The credit crunch has been a series of multiple crises, starting with subprime mortgages in America and progressively sweeping through asset classes and geographies.
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