Sentence examples of "once" in English with translation "antes"

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Having seen him before, I recognized him at once. Como ya lo había visto antes, lo reconocí inmediatamente.
Where the frontier of science once was is now the centre. Donde antes estaba la frontera de la ciencia, ahora se encuentra su centro.
Once, when I went to my friend Kawai's house, he fired a pistol. He thought it was not loaded and pointed it at my mouth, but it was and the bullet grazed my ear before hitting the closet. Una vez, cuando fui a la casa de mi amigo Kawai, éste disparó una pistola. Pensó que no estaba cargada y me apuntó a la boca, pero lo estaba y la bala rozó mi oreja antes de impactar contra el armario.
Angry at Leif Ericson for stealing his thunder 500 years before, Christopher Columbus once wrote a rigorous mathematical proof that showed how Ericson had never actually been to North America. Unfortunately, the proof was too difficult for even the brightest mathematicians to understand. Enfadado con Leif Ericson por haberle robado el descubrimiento 500 años antes, Cristóbal Colón una vez escribió una rigurosa demostración matemática que demostraba que Ericson nunca había estado realmente en América del Norte. Desgraciadamente, ésta era demasiado difícil de entender incluso para los matemáticos más brillantes.
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