! G( |2 r) G# s6 z+ N: ^Meaning: Tendency to think about only one subject9 k( h1 v6 [7 I1 B: t/ Z, w$ G
8 b& W4 \0 v/ q! d: rExample 6 @2 e/ k1 ^" i1 X- s5 s& P( R* y* S" W& L1 s& j6 k) \( o
My son has a one -track mind these days. He thinks only about cars.