大脑在学到什么和在那时产生的背景感觉形成了微妙的联系，作者说，不管那些感知是否有意识的。
The brain makes subtle associations between what it is studying and the background sensations it has at the time, the authors say, regardless of whether those perceptions are conscious.
不幸的是，虽然这样可以通过编译，但是这种方法也不管用，其原因较为微妙。
Unfortunately, although it compiles, this approach doesn't work either, for reasons that are more subtle.
如果您一直在跟踪groovy，不管是阅读文章和blog，还是自己编写代码，您都可能已经遭遇过这门语言的一、两个微妙的问题。
If you've been following Groovy for any amount of time, whether you've been reading articles and blogs or writing code yourself, you may have gotten wind of one or two subtle issues with the language.
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