Xiaochun has a watch, which is 2 minutes behind the standard time every hour. One night at 9:00 sharp, Xiaochun aligned his watch, and when the time displayed on the watch was 7:38 the next morning, what was the standard time?
小春有一块手表，这块表每小时比标准时间慢2分钟．某天晚上9点整，小春将手表对准，到第二天上午手表上显示的时间是7点38分的时候，标准时间是多少．
<result>8</result>