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.