COMB in ADJ (与过去分词连用构成形容词，强调状况或行动的强度)特别，尤其Much- combines with past participles to form adjectives which emphasize the intensity of the specified state or action. (与过去分词连用构成形容词，强调状况或行动的强度)特别，尤其 [emphasis]
I'm having a much-needed rest.
我实在太累了，正在休息。
...a much-improved version of last season's model.