unmodified
US /ˌʌnˈmɑː.də.faɪd/
UK /ˌʌnˈmɑː.də.faɪd/
1.
немодифицированный
not having been changed, especially in a way that is intended to improve something:
:
•
The biofuel can be mixed with petroleum diesel and used in unmodified diesel engines.