The source of the virus remains unclear, but some suspect it comes from camels.

虽然MERS病毒的来源尚不完全清楚，但是，一些研究怀疑骆驼是来源之一。

youdao

Some dressings I ate I suspect were not raw but I was traveling this month, which can make it difficult.

有些沙拉酱我怀疑不是生的，但这几个月以来我一直在旅行，这就让问题变得困难了。

youdao

Market timing can be difficult, but I suspect some degree of it will increasingly be worked into endowment-allocation models.

择时操作并非易事，但我推测这种做法会越来越多地进入到基金会的配置模式中。

youdao

Sheriff Bryant said the motive for the killings was unclear, but noted "it's my understanding that the suspect may have been suffering from some type of mental illness from being in the military himself".

BBC: Chris Kyle murder: War veteran Eddie Routh charged

Some federal sources said it was even too early to say investigators had identified the suspect, but several sources in Boston told CNN that they have a clear identification.

CNN: Sources: Possible suspect sought in Boston bombing

But the Chinese firm will be hard put to run Slavneft without local cooperation which makes some observers suspect it is really only in the auction to bid up the price.

ECONOMIST: Russia's oil auction