And sometimes it is difficult to tell one from the other, for a piece of good expository narrative can also be experiential and aesthetic with its lively and vivid tales.
有时候两者甚至难以区分，因为有的说明记叙文情节生动，也极富欣赏价值。
Open source spying does have its risks, of course, since it can be difficult to tell good information from bad.
当然公开来源的谍报活动的确有它的风险，因为很难区分正确与错误的信息。
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