Translate the following English sentence to French:
"So, in order to justify the inclusion of an additive in a foodstuff, there are three criteria which must be fulfilled, though there is still rather a wide margin for interpretation."
Ainsi, pour justifier l' incorporation d' un additif dans un aliment, trois critères doivent être remplis pour lesquels la marge d' interprétation reste très large :le besoin technologique de l' additif à autoriser.