It also discusses the characteristics of presupposition: the defeasibility and projection problem.

还就预设的特点，可取消性和投射问题加以论述。

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The projection problem for presupposition has been one of the most troublesome aspects in pragmatics.

投射问题一直是预设研究中比较棘手的一个方面。

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Another lighting problem, brought about since the introduction of data projectors into classrooms, is glare reflecting off the projection screen into pupils' eyes.

还有一个因使用数码投影仪带来的光照问题，即学生常常受到从投影屏反射的强光照射。

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The problem with that lofty projection, several economists say, is that three of those holidays occur every year, so the cost can't all be laid at the feet of William and Kate.

WSJ: Economists' Royal Wedding Jitters Don't Add Up

However, the US freely admits that this is as much a problem of law as it is about the projection of military power.

FORBES: Cyber Command Appointment Offers More Questions Than Answers

Another problem could be more substantial, or may have been confined to the projection at my screening, where the audio quality of some of the music tracks left a lot to be desired.

WSJ: Film Review