1 . not the why

but we understand only ? and approximately how , not the why .但我們僅僅??大概了解??只知其然，卻不知其所以然。

2 . not recognized for what

not recognized for what it is ., 不知其所以然.

3 . the visitors understood why

the voiceover described it as " one of the most powerful tools we have in the fight against disease " , but few of the visitors understood why .隨后，幕后音開始解說道，“人的心臟是人類所擁有的用來對付疾病的最強大的武器之一”，但是很少人卻不知其所以然。

4 . not recognized for what it is

not recognized for what it is不知其所以然