freeze,freeze over

freeze使……结冰
We ate some of the fruits and froze the rest.
我们吃了一些水果，把剩下的冷藏起来。

freeze over全结冰
The lake was frozen over until late spring.
那湖全让冰封住了, 到晚春才解冻.

注意前者是及物动词，后者是不及物动词。