勾兑

　　仲夏午后，闷热，雨将至。空荡荡的教室里，少年在黑板前奋笔疾书。 　　“1”，是那根中指，是高耸的欲望，也是少年冥思苦想的数学题的解。 　　Muggy summer afternoon, the rain will come. An empty classroom a teenager is writing on the blackboard and trying to solve a math problem. 　　1. It's the middle finger, it's the erect male genitalia, it's also th e answer to the math problem which troubled the boy so long.