1N-VAR 霜;霜冻;严寒天气 When there is frost or a frost, the temperature outside falls below freezing point and the ground becomes covered in ice crystals. 霜;霜冻;严寒天气
There is frost on the ground and snow is forecast.
地上结霜了,而且预报说会有雪。
The wind had veered to north, bringing clear skies and a keen frost.
2PHRASE 冰点以下…度;零下…度 When someone says that there are a particular number of degrees of frost they mean that the temperature is that number of degrees below freezing point. 冰点以下…度;零下…度 [British]