不曾 bùcéng never

曾几何时 céngjǐhéshí once upon a time

曾经 céngjīng ever; once

曾孙 céngsūn great-grandson

似曾相识 sìcéngxiāngshí deja vu

未曾 wèicéng never

也曾 yě céng also

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