未知数
unknown quantity / (figuratively) unknown
(uncommon) to riot, to cause a commotion
a kowtow, a deep bow so low that one's head touches the ground in Chinese culture
(cytology, neurology) Synonym of 神経細胞 (shinkei saibō, “nerve cell”); a neuron
There are still many unknown quantities in solving this problem.
unknown quantity
(figuratively) unknown
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