My best friend's photographs were first on display in Tibet.为什么在display前面用介词on?

问题描述:

My best friend's photographs were first on display in Tibet.为什么在display前面用介词on?

我最好的朋友的摄影作品最初在*展出
(be) on display 是固定搭配,是展览的意思
相当于 (be)on show