Host selling involves blending advertisements with regular programming in a way that makes it difficult to distinguish one from the other.

“销售主持人”这种形式将广告和常规的节目安排以某种方式掺杂在一起，使两者难以被区分开。

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It is often very difficult to distinguish between the two.

这两者时常很难去区分。

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Subspecies are often difficult to distinguish from one another.

区分不同的亚种是很困难的。

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He says, "They aren't authors. They're founders of discursivity," and then he grants that it's kind of difficult to distinguish between a founder of discursivity and an author who has had an important influence. Right?

他说：“他们不是作者，他们是散漫性的创始人“,然后他认为很难区分,究竟散漫性的创始人和作者,哪个的影响更重要，对吗？

耶鲁公开课 - 文学理论导论课程节选

It becomes increasingly difficult to distinguish between your roles as state taxpayer and federal taxpayer.

FORBES: Medicaid benefits politicians more than it benefits citizens

With current foot-and-mouth vaccines it is difficult to distinguish between immunised livestock and those which have been infected.

BBC: Synchrotron yields 'safer' vaccine

Truth be told, the difference between A Broken Consort and Skelton's solo projects can be difficult to distinguish.

NPR: A Broken Consort: Landscapes As Music