True friendship is like sound health,whose value of it is seldom known until能不能将until替换成unless?

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Truefriendshipislikesoundhealth,whosevalueofitisseldomknownuntil能不能将until替换成unless?Truefriendshipisl

True friendship is like sound health,whose value of it is seldom known until能不能将until替换成unless?
True friendship is like sound health,whose value of it is seldom known until
能不能将until替换成unless?

True friendship is like sound health,whose value of it is seldom known until能不能将until替换成unless?
不可以.
not.until:直到…才
表达的意思是"直至某时才做某事".动词为延续性或非延续性都可以.
E.G.Don”t get off the bus until it has stopped.
unless是除非、除.外的意思.
until有时间上的延续性,unless表示的是条件上的变动.两者使用的境况不同,要根据右面的分句来确定使用哪个.
要看比较学术全面的解说,请参看: