The sky is closed
It's a Chinese idiom. Pinyin is ti ā NN í NGD ì B ì, which means it's very cold in winter. From the book of Jin, biography of Zhang Xie.
The origin of Idioms
The book of Jin, biography of Zhang Xie: "the sky is closed, the wind is fierce and frost flies."
Idiom usage
Winter is very cold.
The sky is closed
The disease harms the people and the country - bìng mín hài guó