( ( ( ( ( ( The ( thermal effect ) ) ( might ( flow ( through ( a ( cycle-water-cooling system ) ) ) ) ) ) , ) then ) ( ( a ( radial ( temperature ( gradient distribution ) ) ) ) ( may ( be ( formed ( inside ( the rod ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (DT The) (JJ thermal) (NN effect)) (VP (MD might) (VP (VB flow) (PP (IN through) (NP (DT a) (JJ cycle-water-cooling) (NN system)))))) (, ,) (RB then) (S (NP (DT a) (JJ radial) (NN temperature) (NN gradient) (NN distribution)) (VP (MD may) (VP (VB be) (VP (VBN formed) (PP (IN inside) (NP (DT the) (NN rod))))))) (. .)))
The thermal effect might flow through a cycle-water-cooling system, then a radial temperature gradient distribution may be formed inside the rod.
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (NP (DT the) (NN temperature)) (PP (IN of) (NP (NN water)))) (VP (VBZ is) (VP (VBN increased) (PP (IN after) (S (VP (VBG being) (VP (VBN used) (PP (IN in) (S (VP (VBG cooling)))))))))))) (, ,) (NP (PRP it)) (VP (VBZ is) (NP (JJ thermal) (NN pollution))) (. .)))
When the temperature of water is increased after being used in cooling, it is thermal pollution.