“冻硬”怎么读

现在天气冷极了，地面都冻硬了。It was bitterly cold now and the ground was frozen hard.把它冻硬，但是不要硬得像石头一样。Freeze it only until firm but not rock solid.雪橇在冻硬了的雪上顺利滑行.Sledges run well over frozen snow....

“冻硬”的英语可以翻译为：adfreezing ...