Kyoko, growth is narrowly based on the A and B sectors = the growth based on the A and B sectors is narrow (limited in size and scope to only those sectors). Yes, "only" has a negative connotation here. The implication is that the lack of growth in the C sector is having a negative effect on overall growth (the growth of all the sectors combined). with the C sector making a sustained contribution....there is no increased contribution, NO growth, only a constant uniform contribution.

"Narrowly" means within a small or narrow range. "Only" does indeed have a negative connotation. I am wondering though if the sentence is wrong - it might be: "..., with only the C sector making a sustained contribution these days." The interpretation would be that sectors A and B make little contribution, while only C actually makes a sustained (continual) contribution. I would have to see the context.

Hi every one and thanks a lot. I got confused a little bit again. I'll think it over from the context and the real situation of what I am reading about, thanks.

Carefully.