Breakdown of Ceux qui s'aventurent à cette profondeur ont besoin d'oxygène.
qui
who
ce
this (before a noun)
à
at / to / in (general locations) / about (what one thinks about / reacts to)
avoir besoin de
to need
ceux
the ones (masculine plural)
l'oxygène
the oxygen (m)
s'aventurer
to venture
la profondeur
the depth
Questions & Answers about Ceux qui s'aventurent à cette profondeur ont besoin d'oxygène.
Why is it d'oxygène and not de l'oxygène?
After the expression avoir besoin de (to have need of), the partitive article (du, de la, de l') is dropped when you are talking about an uncountable noun in a general sense. You just use de (or d' before a vowel). If you were referring to specific oxygen, like "the oxygen in this tank," you would include the definite article: besoin de l'oxygène.
What exactly is Ceux qui?
Why does s'aventurer take the preposition à here?
The pronominal verb s'aventurer (to venture) uses à when talking about pushing limits, reaching a certain point, or going to a specific abstract measure like a depth (cette profondeur) or a distance. If you were talking about venturing into an enclosed physical space, like a forest or a cave, you would use dans instead.
How could we use the current lesson's topic (à moins de) with this sentence's vocabulary?
The phrase à moins de (unless) is followed by an infinitive when the subject of both clauses is the same. If we change the sentence to "One does not need oxygen, unless venturing to this depth," it becomes: On n'a pas besoin d'oxygène, à moins de s'aventurer à cette profondeur.
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