n.溶解；解冻；除霜
动词defrost的现在分词形式.
The refrigerator's defrosting function is very good. 这个冰箱除霜的功能很好。
Finally, two measures to improve the defrosting performance of this chiller have been put forward. 最后，作者提出了两种改进风冷热泵冷热水机组除霜性能的措施。
