Utterance is based on ();it is the realization of the abstract meaning of a sentence in a real situation of communication,or simply in a context.
There is a growing realization that the only()way to achieve further reductions in vehicle emissions is to replace conventional diesel fuel and gasoline with cleaner-burning fuels.
P ()refers to the realization of langue in actual use.
There is a growing realization that the only effective way to achieve further reductions in vehicle()is to replace conventional diesel fuel and gasoline with cleaner-burning fuels.