Don't make much ado about nothing.
不要小题大做。
A mountain was once greatly agitated. Loud groans and noises were heard, and crowds of people came from all parts to see what was the matter. While they were assembled in anxious expectation of some terrible calamity, out came a Mouse.
有一次，一座大山发生了异动。人们都听到了很大的呻吟和喧嚷的声音，于是人群从各处涌来，想看个究竟。他们焦虑地聚集在一起，以为会有可怕的灾难发生，这时跑出来一只老鼠。