in perfect silence
It's a Chinese idiom, y ā Qu è w ú w é n, which means there is no sound of crows and sparrows. It's very quiet. It comes from three quatrains written by Su Shi of Song Dynasty.
Idiom explanation
Not even crows and sparrows. It's very quiet.
The origin of Idioms
Su Shi of Song Dynasty wrote three quatrains: "when the wind blows and the rain comes into the appendix, the black magpie is silent and the night comes to the appendix."
in perfect silence
warning taken from the overturned cart ahead - fù zhōu zhī jiè
suffer from both the outside and the inside - wài gǎn nèi shāng