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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This was not a big problem from 16th-century sailors, of course, and the Mercator projection remains popular to this day.

当然，对于16世纪的水手来说，这不是一个大问题，如今 仍然很普遍。

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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.

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

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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