1. Heretofore, doctors have tried low fat diets to reduce the cholesterol in the blood.
    迄今，医生一直试用低脂肪饮食来降低血液中的胆固醇。

1. heretofore

1. 迄今：hereto 到此为止 | heretofore 迄今 | hereunder 在此之下

2. 此时以前：heretic 异教徒 | heretofore 此时以前 | heritage 遗产

3. 直到此时, 迄今, 此时以前：name 命名, 提名, 叫出, 指定 | heretofore 直到此时, 迄今, 此时以前 | revoke 撤回, 废除, 宣告无效

4. 迄今/到此为止/以前/于过去/此时以前：hereto /到此为止/关于这个/ | heretofore /迄今/到此为止/以前/于过去/此时以前/ | hereunto /到此为止/迄今/

1. 此前;迄今
    Heretofore means ''before this time'' or ''up to now''.

    e.g. They reported that clouds are an important and heretofore uninvestigated contributor to the climate.
           他们报告说，云是影响气候的一个重要因素，但迄今为止没有进行过研究。

1. used in negative statement to describe a situation that has existed up to this point or up to the present time

    e.g. So far he hasn''t called
           the sun isn''t up yet

    Synonym: so farthus farup to nowhithertoas yetyettil nowuntil now