However, if these pictures are not only flashed very briefly but are also hard to make out to begin with and have a grainy pattern displayed right after them, they often cannot be seen.

然而，如果这些影像刚开始的时候很难辨认出来，即使简短的呈现影像之后再呈现纹理图案，他们通常也是无法辨别的。

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On the other hand, thought suppression is not only very, very difficult, but it works only very briefly, and has some very nasty unintended consequences.

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