YOU SAID:

Euclid's Fifth Postulate was never proven true until recently

INTO JAPANESE

ユークリッドの5番目の公約は、

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Euclid's fifth pledge,

INTO JAPANESE

ユークリッドの5番目の約束、

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Euclid's fifth promise,

INTO JAPANESE

ユークリッドの5番目の約束、

BACK INTO ENGLISH

Euclid's fifth promise,