je ne sais qua

名词 n.

英文释义

名词 n.
  1. Misspelling of je ne sais quoi. alt-of,misspelling,uncountable
    — The ginger flavor adds such a nice je ne sais qua to the cake.

词源

Probably a simple misspelling. Possibly from conflating quoi with the qua in sine qua non.
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