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Ever wonder why sticking your finger in your belly button makes you want to spend a penny? 你有没有想过为啥用手抠肚脐眼会让你想上厕所？ If you don't know what we're talking about, you should lift up your shirt in the name of scientific adventure and have a good poke around in your belly button. 如果你不知道我们在说什么，那就撩起衬衫，然后好好地以科学探索之名来抠抠肚脐眼。 Don't just fanny about around the sides as you've got to get right in there to feel the tingle. 不要只是做表面功夫要抠里面直到感觉有点刺痛。 | 
