можно с уверенностью сказать, что
• It is safe to say [or It can be said with confidence (or assurance)] that diesel oil is preponderantly used.
• We can state with assurance that ...
Русско-английский научно-технический словарь• It is safe to say [or It can be said with confidence (or assurance)] that diesel oil is preponderantly used.
• We can state with assurance that ...
Русско-английский научно-технический словарь