No. Power can grow, but not grow up.
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AlpheccaStarsI would avoid "stretch of time"; that's stretching it. "period of time" is better.
soheil1As we know, a genitive can be formed in two ways.Why have you used the of-construction? Just because interest is not a part of body? Cannot we use the apostrophe construction?I used it because you did so in your original post. If phrases in a post are grammatically correct, I do not change them.