Or is it some sign of weather that I do not know?

要不，这是什么我不懂得的天气征兆？

youdao

A red sky in the morning is said to be a sign of bad weather.

早晨天上呈红色据说是坏天气的预兆。

youdao

A red sky in the morning is said to be a sign of bad weather.

早晨天上呈红色据说是坏天气的预兆。

youdao