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问题: 这句话是什么意思?太难理解了!!!

Sauans merely remove a little body water,and health farms,says the report,serve as expensive holidays.
这句话什么意思?这里的 serve as 是什么意思?为什么可以被play the role of替代? 为什么不能被 are regarded as 替代?
谢谢!

解答:

sever as 和play the role of 都是主动。be regarded as 是被动。另外 sever as 和play the role of 都有“充当/担任...角色”的意思。be regarded as 没有这样的意思。因此不能互换。