21.   As digital effects become more realistic and less expensive, many stuntmen fear computer graphics could turn rough-and-tumble Hollywood daredevils into glorified stand-ins.

22.   Because the accumulation is gradual, its effects become more apparent as the patient ages.

23.   He predicted their effect will become stronger in the coming decades.

24.   He also said the tactic would be counterproductive when the effects become more apparent.

25.   While elaborate digital effects have become commonplace in studio movies, digital cameras are revolutionizing low-budget filmmaking with their ease and economics.