求翻译：In past years blue-green algae would appear in Lake Tai in July or August but last year it was detected at the end of May.是什么意思？

待解决

悬赏分：1 - 离问题结束还有

In past years blue-green algae would appear in Lake Tai in July or August but last year it was detected at the end of May.

问题补充：

匿名	2013-05-23 12:21:38 在过去几年出现在太湖蓝绿藻会在七月或八月，但去年它在检测到5月底。

匿名	2013-05-23 12:23:18

匿名	2013-05-23 12:24:58

匿名	2013-05-23 12:26:38

匿名	2013-05-23 12:28:18

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