Alan Greenspan went on to defend some of the complex financial products called derivatives. But he said there are "some serious problems" with credit default swaps. Buyers use this kind of derivative as insurance against losses on debts they are owed.
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some serious health problems 一些严重的健康问题
This has cause some serious problems.
这已经引起了一些严重的问题。
Yet some serious problems persist in election observation.
然而，选举观察也存在不少严重问题。
We could be in for some serious problems," Chamberlin said.
我们可能会遇到一些严重的问题。” Chamberlin说。
Some argue it is diverting discussion from more serious problems, like the economy.
VOA: standard.2010.01.30
Some believe vaccines can cause serious health problems.
VOA: standard.2009.12.18
"They're not quite there yet. There have been some serious efforts to deal with a combination of long-standing problems in the auto industry and the current crisis which has seen the market for new cars drop from 14 million [vehicles in annual sales to nine million.
VOA: standard.2009.03.30
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