  Visual Training 视力训练

  The squad were having "visual training". One smart recruit was asked by the officer to count how many men composed a digging party in a distant field. The party was so far away that the men appeared as mere dots, but unhesitatingly the recruit replied: 
  班里正在进行"视力训练"。一个聪明伶俐的新兵被班长叫出来数远处旷野上采掘队的人数。采掘队在很远的地方，那些人看起来只是一些小点儿。但是这个新兵毫不犹豫的回答：

  "Sexteen men and a sergeant, sir." 
  "十六个士兵和一个中士，长官。"

  "Right; but how do you know there's a sergeant there?"
   "正确。可你如何知道那儿有一个中士？"

  "He's not doing any digging, sir."
  "他不干活，长官。"