un jour

one day, someday (at unspecified time in the past or future)

c'est

1. it is (used to define the preceding word)
2. it is (used to introduce a focus)
3. this is

un

• Article

  an, a

• Num
• Pron
• Noun

véritable

veritable

talus

slope, embankment

qui

• Pron

  1. who, whom
  2. who, whom (after a preposition), which, that

• Conj

apparaît

third-person singular present indicative of apparaître

jour

1. day
2. daylight, light
3. opening, aperture