You use hitherto to indicate that something was true up until the time you are talking about, although it may no longer be the case.
例句
The polytechnics have hitherto been at an unfair disadvantage in competing for pupils and money...到目前為止，理工?？茖W校在爭取生源和資金方面一直處于劣勢。Hitherto, the main emphasis has been on the need to resist aggression...迄今為止，一直重點強調的是要抵抗侵略。
英漢詞典釋義
adv.
到目前為止
Hitherto he had experienced no great success in his attempt.到目前為止, 他的嘗試還沒獲得成功。
英英詞典釋義
Adverb
1. used in negative statement to describe a situation that has existed up to this point or up to the present time;