This is the 4118th most frequent French word.
contiennent
"Contain."
Here, 'contiennent' is the third person plural form of the verb 'contenir', indicating that the subject (boxes) are holding or including chocolates.
Ces boîtes contiennent des chocolats délicieux.
These boxes contain delicious chocolates.
In this sentence, 'contiennent' refers to the books encompassing or having within them valuable data.
Les livres dans cette bibliothèque contiennent des informations précieuses.
The books in this library contain valuable information.
'Contiennent' is used metaphorically to express that the words involve or embody profound wisdom.