Let me start by reviewing the problem that we were considering last week.
让我们先来回顾一下上周的问题。
If considering time relationship between events, the problem becomes more complicated.
如果考虑事件间的时间关系，问题将变得更为复杂。
He paced back and forth in the room, considering how to solve this problem.
他在房间里来回踱步，思量着如何解决这个问题。
He paced back and forth in the room, considering how to solve this problem.
他在房间里来回踱步，思量着如何解决这个问题。
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