新概念英语3第24课的一句话'

问题描述:

新概念英语3第24课的一句话'
family has some terrible secret which has been concealed from strangers for years?
secret并未加S,我查了词典,SECRET好象是可数的,怎么事?

some有某一个的意思,指未知或者不确定的人或者物
例如
some woman came to me and told me that she was my classmate