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to carefully consider the facts of a situation in order to understand something, make a decision, or solve a problem
!["to [use] {one's} [head|noodle|naggin]" 的定义和意义](/assets/icons/dictionary-link.svg){kind=icon}
in a very nervous or frustrating state of mind in face of a problem or situation one knows very little or nothing about
said when one does not have a definite answer to a particular question, similar to the questioner
to fail to understand or interpret or understand something correctly
used when one is incapable of understanding or remembering a particular thing
used to describe something that is complicated due to not being clearly described or shown
to be incapable of understanding even the simplest concepts
the limits of human knowledge or understanding, representing areas that remain unknown or unexplored
to fully understand something difficult, complicated, or strange
to make an attempt to understand someone or something that is puzzling
