1. In the last act, a gaoler would always come on to the stage with a letter which he would hand to the prisoner.
2.The curtain went up on the final act of the play and revealed the aristocrat sitting alone behind bars in his dark cell.
In the last act, 在最后一幕剧里， 后面讲的是一个剧情。用in表示在最后一幕中。
The curtain went up on the final act... 这里用On 和curtain有关，因为帷幕拉开，on表示一开始。如果用in的话，会误以为剧中的一个情节是把帷幕拉开。岂不可笑?
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