bù jiě
to not understand
to be puzzled by
indissoluble
bǎi sī bù jiě
to remain puzzled after pondering over sth a hundred times (idiom)
to remain perplexed despite much thought
yuǎn shuǐ bù jiě jìn kě
lit. distant water does not cure present thirst; fig. urgent need
a slow remedy does not address immediate needs