r used in negative statement to describe a situation that has existed up to this point or up to the present time
adv. 直到此时, 此时以前, 迄今
1. The project has been successful heretofore, but we need to prepare for potential challenges ahead.
这个项目到目前为止一直很成功，但我们需要为未来可能的挑战做好准备。
2. Heretofore, the company has focused on local markets, but now it plans to expand internationally.
迄今为止，这家公司一直专注于本地市场，但现在计划扩展到国际市场。
3. The heretofore unknown artist gained recognition after his work was displayed in the gallery.
这位迄今为止不为人知的艺术家在他的作品在画廊展出后获得了认可。