A four-minute program might sometimes take six minutes to get through, depending on my concentration level.
"Maybe that raised the concentration level to bring the pitching I had today."
"Everybody will understand there's a job to be done, and there has to be a concentration level on it."
However, the concentration levels are so small that eating the fish is not considered a health risk.
Bioaccumulative means their concentration levels increase as they move up the food chain.
"The concentration level was there and, all of a sudden, it's gone."
A healthy breakfast will sustain your energy and concentration levels.
To show I can still play after so many years, my concentration level might go down.
The concentration level before a game is much higher, I think.
Or is it that he just doesn't have the concentration levels to keep plugging away over 4 days.