"The last two hours of art class" 这个短语来源于英语表达"the last (time period) of (event or activity)" 的结构，用来描述某个时间段内最后一段时间的活动或事件。
例句1:
The last two hours of the meeting were spent discussing the budget.
会议的最后两小时花在讨论预算上。
例句2:
The last hour of the fpght was bumpy.
飞行的最后一小时很颠簸。
例句3:
I will be busy for the last two hours of the day.
我会在一天的最后两小时忙碌。