“蜀犬吠日”这个成语比喻少见多怪（对本来很平常的事情，由于见识短浅而感到奇怪。）

A Sichuan Dog Barks at the Sun

A leading writer of the Tang Dynasty(618-908)Liu Zongyuan, related¹ how in Sichuan Province In southwest China it was cloudy and foggy most of the year. The sun was hardly eversee. So if the sun came out, the local dogs would feel that something strange was happening, and barking loudly.

This idiom is used to indicate being surprised at somthing normal, due to one's ignorance².