题目内容：

We have know for a long time that flowers of different plants and close at different time of a day

优质解答

显然这是一句中国英语
正确的应该这样说吧
We have known for a long time that flowers from different plants wither at different times of the day.
我们早就了解到不同植物的花会在一天的不同时间凋谢.