迄今

迄今

"迄今" means "up to now" or "so far."

迄今为止 is used as 'up to now', indicating the time until the present moment, expressing the period during which progress has occurred.

迄今为止，这项技术已经取得了显著的进步。

Up to now, this technology has already achieved significant progress.

迄今 means 'so far' here, indicating that until the current moment, a certain desired event has not occurred.

我们迄今未找到解决问题的最佳方法。

So far, we have not found the best solution to the problem.

迄今 is used again to convey 'up to now', showcasing ongoing efforts within the time frame leading up to the present.

虽然许多困难存在，团队迄今仍在努力工作以实现目标。

Although many difficulties exist, the team has been working hard up to now to achieve their goals.