因认识不清说不出cannot say for sure
我也说不上。
I cannot say for sure either.
我说不上这些学校哪一个比较好些。
I cannot say for sure which is the best out of these schools.
谈不到cannot be said to
这些资料说不上有什么价值。
These materials cannot be said to have any value.
说不上好，但也说不上坏
cannot say it is good but cannot go as far as saying it is bad
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