Apple Incorporation last month said that its quarterly profit had almost doubled in the first quarter  of  2013, but its days of sharp growth were over.

【翻译】苹果公司上个月表示，2013年第一季的季度利润几乎翻了一番，然而，其急剧增长的日子已经过去。

我认为，that its days of sharp growth were over，中的that 系but 之误。全句应为：

Apple Incorporation last month said that its quarterly profit had almost doubled in the first quarter  of  2013, but its days of sharp growth were over.

两个理由：

1. 若是两个that从句，应该有and 连接，然而句子没有。

2. 从前后文关系看，应该是but 表转折。

我猜测，这是从新闻英语录下的句子，将but 误认为that。请网友查看句子出处。