The elephant in the room. 明摆着的难题；众所周知却避而不谈的事
We all know the elephant in the room is poor communication between departments, how can we resolve this?
我们都知道部门之间的沟通有很大的问题，却视而不见，怎么才能解决这个问题呢？

White elephant. 昂贵而无用的东西
Now that the kids are in college, John's swimming pool is a white elephant that no one uses.
现在孩子们都上大学去了，John的游泳池放着根本就没人用。

Pink elephant 幻觉
He was so drunk. He was seeing pink elephants everywhere.
他喝醉了；已经出现幻觉了。

Memory of an elephant 非常好的记忆力
Jane has the memory of an elephant!
Jane的记忆力非常好。

Dumbo 《小飞象》
He has ears like Dumbo.
他有小飞象一样的耳朵。

Big as an elephant. 像大象一样体型巨大
Strong as an elephant. 像大象一样强壮