find a common denominator

例句：

1. 1. I found the book on the table when I searched for it in the library.
   我在图书馆里寻找这本书时，在桌子上找到了它。
2. 2. They discovered a new species of bird in the Amazon rainforest.
   他们在亚马逊雨林中发现了一种新的鸟类物种。
3. 3. The scientist ascertained that the theory was incorrect based on the data they collected.
   科学家根据他们收集的数据确认了那个理论是错误的。