President Obama is walking a fine line in his 2011 budget.He

Idiom Definitions for 'Walk a fine line'----------------------------------------------------------------------If you have to walk a fine line,you have to be very careful not to annoy or anger people or groups that are competing。('Walk a thin line' is an alternative。)1。There's a fine line between boastful and confident。And you need to learn it。在自负和自信之间有一条线,你需要知道这条线在哪。2。Others say that there's a fine line between the pageants and sexual exploitation。其他人说,选美和性剥削之间只有非常细微的界线。3。She wished he would stop talking like that,but Minmei knew she was walking a fine line again。她希望他不要再那么说话,可明美知道自己要小心行事才行。4。Luxury-goods executives must walk a fine line when cutting prices。奢侈品行业人士降价时必须特别谨慎。5。So,you know,when I'm playing well on clay,it's a fine line that I kind of have to walk between those two。所以你知道,当我在红土上打得很好,那么我需要掌握好这两方面。It means to steer a risky and difficult course between two policies。。。to be so near the edge of one that you risk falling into another less desirable one。All of which is a pretty unclear definition,so maybe an example might help。（下面这个句子和你的问题很相似）"With his current policy approach towards Iraq,President Bush walks a fine line between the interests of national security and those of warmongering。"The metaphor's from tightrope walking,I'd guess。朗文和麦克米兰和柯林斯词典都没有walk a fine line的解释这是一个新词语,应该是由walk a tightrope （这个idiom是可以在朗文上查到的）而来,国外论坛上也有人这么猜。A fine line is a very thin thread like a fishing line。正好我也看着CNN里面提到了a fine line to walk。。一起学习吧。