as yet 到目前为止


but this is unconfirmed =这没得到确认
but this is as yet unconfirmed=这到目前为止还没得到确认。

查字典啊，如下牛津双解
as (of) yet, used when saying that something has not happened up to now
到目前为止

on an as yet undecided date 在还未确定的某个日期

没事多查字典，要不然你没法看英语新闻。
--
修改:thinksmith FROM 42.236.188.*
FROM 42.236.188.*