英汉词典

1. 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.

    e.g. There is frost on the ground and snow is forecast...
           地上结霜了，而且预报说会有雪。
    e.g. The wind had veered to north, bringing clear skies and a keen frost.
           风向已经转北，带来了晴朗的天空和严重的霜冻。

2. 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.

    e.g. We had 11 degrees of frost last night.
           昨天夜里气温降到了零下 11 度。