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mùlù
fǎwénjièshì
  1. n.  problème in signifiant ou insoluble
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zuānniújiǎo jiānniú jiǎo jiān cūnzuānniújiǎo jiān degāo niú jiǎo jiān
gāo niú jiǎo jiānběi cài zhèn niú jiǎo jiān fàn diànniú jiǎo jiān , niú jiǎo jiān 'ér