frost的形容词形式是什么

例句：

1. The air was thin and crisp, filled with hazy sunshine and frost.

空气稀薄清新，其间日光蒙眬，寒气逼人。

2. We had 11 degrees of frost last night.

昨天夜里气温降到了零下11度。

3. It will be a clear night with some ground frost .

今夜晴，部分地面有霜冻。

4. Jack Frost was threatening to kill the new plants.

霜降危及新作物的`存活。

5. The frost last week was a great calamity to the citrus industry.

上周的霜冻对柑橘种植业是一场大灾难.

6. Fill the cooling system with antifreeze as a protection against frost.

在冷却系统里加防冻剂以防止霜冻.

7. The towering pine and cypress trees defy frost and snow.

松柏参天傲霜雪.