v increase in extent or intensity
v make more intense, stronger, or more marked
v become more intense
v make the chemically affected part of (a negative) denser or more opaque in order produce a stronger contrast between light and dark
n. （使）增强, （使）加剧( intensify的名词复数 )
v. （使）增强, （使）加剧( intensify的第三人称单数 )