To climb the mountains 强调具体的某一次.
hard work = difficult = not easy 此处的work为不可数名词,只有当“著作,作品”讲才可数.
work 作为n.(名词)有以前的意思:
[U] 工作,劳动,作业 doing or making sth
[U] 职业,职务,工作地点 the place where you have a job
[U] 工作成果,产品 sth that you make or do
[C] 著作,作品 a book,painting or piece of music
[P] 工厂 a place where people make things with machines
[U] 功,做功 force multiplied by distance
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